Small knowledge of mathematics related to animals

1. Little scientific knowledge about animals.

Persimmons can't be eaten with crabs. 1) Rabbits beat the ground with their legs to transmit information, mostly with their hind legs, which is a way for them to express their feelings to female rabbits. (2) The largest monkey in the world is a baboon, and the smallest monkey is a bonobo. (3) Dogs wag their tails when they are happy. When they are angry, they straighten their tails backwards. Dogs only pick up their tails. (4) The leopard grinds its claws on the tree. The stag rubbed its horns on the trunk to sharpen them. Wild boars often grind their teeth on trees. (5) Polar bears wear thick white fur coats. Seals and walruses have thick fat to keep their bodies warm. (6) "Four Elephants", whose real name is Elk, is a rare animal in China. The origin of plants was 2.5 billion years ago.

It was not until 438 million years ago (Silurian) that green algae got rid of the shackles of water environment, landed on the earth for the first time, evolved into ferns, and clothed the earth with green clothes for the first time. 360 million years ago (Carboniferous), pteridophytes were extinct, replaced by lycopodium, wedge-shaped, true ferns and seed ferns, forming a swamp forest.

The main plants of Paleozoic were almost completely extinct 248 million years ago (Triassic), while gymnosperms began to rise and evolved pollen tubes, completely getting rid of the dependence on water and forming dense forests. Angiosperms (flowering plants) began to appear 1.45 million years ago (Cretaceous), and developed rapidly in the later period, replacing gymnosperms and forming the angiosperm era that continues to this day.

Modern types of pine, cypress, and even Metasequoia, Sequoia and so on. , are produced in this period. Characteristic plants have the ability of photosynthesis-that is, they can produce food by using water, minerals and carbon dioxide with the help of light energy and chlorophyll that animals do not have.

After releasing oxygen, glucose, an energy-rich substance, remains as a component of plant cells. Plants have obvious cell walls and nuclei, and the cell walls are composed of glucose polymer-cellulose.

The ancestors of all plants are unicellular non-photosynthetic organisms, which swallowed photosynthetic bacteria and formed a mutually beneficial relationship: photosynthetic bacteria live in plant cells (so-called endosymbiosis). Finally, bacteria become chloroplasts, which are organelles that exist in all plants but cannot survive independently.

Plants are usually inactive because they don't need to look for food. Most plants belong to angiosperms, which are flowering plants, including many kinds of trees.

The longest plants on land are in the tropical forests of Africa, where there are towering trees, exotic flowers and plants, and there are also "ghost ropes" that trip you. This is a white rattan wrapped around the tree for countless times. White rattan, also called provincial rattan, is also produced in Yunnan, China.

Rattan chair, rattan bed, rattan blue, rattan bookshelf, etc. Are made of rattan as raw materials. Rattan stems are usually very thin, as thick as a small handleless wine cup, and some are thinner.

It has a cluster of pinnate leaves at the top, and there are thorns on the leaves. The upper part of the stem is long and strong until the tip of the stem, and it is covered with large, pointed downward-bending spines.

Like a barbed whip, it swings with the wind. As soon as it touched the big tree, it clung to the trunk and soon grew a bunch of new leaves. Then it continued to climb along the trunk, while the leaves below gradually fell off.

After climbing to the top of the tree, the white rattan kept growing, but there was nothing to climb, so its longer and longer stems hung down, and the tree was regarded as a pillar and wound around it into countless strange circles. Rattan is 300 meters long from root to top, which is twice as long as the tallest eucalyptus in the world.

If the tallest tree holds the World Tree Height Competition, only Australian almond eucalyptus will be eligible to win the championship. Almond eucalyptus is generally as high as 100 m, and one tree is as high as 156 m. Its trunk soared into the sky, reaching 50 stories.

This is the tallest tree that man has ever measured. Birds are singing at the top of the tree, which sounds like the buzzing of mosquitoes under the tree.

This kind of tree is 30 meters long around the base, with straight trunk, obviously tapering upward, and dense branches and leaves at the top. The leaves are strange. Generally, the surface of a leaf is facing the sky, but its side is facing the sky, like hanging on a branch, parallel to the projection direction of sunlight.

This strange appearance is to adapt to the dry climate and strong sunshine, reduce direct sunlight and prevent excessive evaporation of water. The tallest broad-leaved trees in China-Wangtian Tree and Qingtian Tree. In the tropical dense forest of Xishuangbanna, Yunnan Province, China, a huge giant tree was discovered in the 1970s. Its graceful posture and tall trunk hold its head high above all the trees, making it impossible for people to look up at its top, and even the sensitive altimeter can't help here.

Therefore, people call it a tree looking up to heaven. The local Dai people call it an umbrella tree.

Looking up at the sky, trees can generally reach 60 meters. People have measured and analyzed a tree and found that it grows quite fast. A 70-year-old tree is 50 meters high.

Individual even as high as 80 meters, DBH is generally around 130 cm, up to 300 cm. These rare giant trees in the world stand in the upper layer of the valley rainforest, which is generally more than 20 meters higher than the trees on the second floor. They really have the momentum to go straight into the sky! Wangtianshu belongs to Dipterocarpaceae, Lu 'an.

Liu An belongs to this family, with a total of 1 1 members, most of whom live in Southeast Asia. Wangtianshu only grows in Yunnan, China, and is a rare and special tree species unique to China.

The tree is tall and straight, with alternate leaves, pinnate veins and yellow flowers arranged in panicles, emitting a fragrance. Its fruit is hard.

Cephalotaxus chinensis generally grows in 700- 1000 meters of valley rain forest and mountain rain forest, forming an independent community type and displaying a unique natural landscape. Therefore, the academic community regards it as a symbolic tree species of tropical rain forest.

Wangtianshu has excellent material, fast growth and high productivity. The trunk volume of a tree can reach 10.5 cubic meter, and the average annual growth of a single tree is 0.085 cubic meter, which is 2-3 times that of other tree species in the same forest. Therefore, it is an excellent tree species worth popularizing.

At the same time, its wood is rich in gum, its flowers contain perfume oil and many other unknown components, which need further analysis and utilization. Because the tree of looking up to heaven has such characteristics.

2. The mathematical genius of animals

15 when the snake crawls, take the sine function diagram; Ants have superb counting skills; Cormorants can count; Spider's "gossip" web is a complex and beautiful octagonal geometric pattern; Wild monkeys and chimpanzees have mathematical minds and can measure. 16A sentence: for example. Take snakes as an example to illustrate that there are considerable mathematical principles in the living habits of animals. B: List the numbers. Specifically, the number and power distribution of ants are highly consistent with the proportion of grasshopper block size, which highlights the fast and accurate ant counting. (It is pointed out that the explanation method is 1, which explains the function of two points) 17 cannot be deleted. "Even if" and "Ye" are used together to indicate a hypothetical relationship. People use tools to draw pictures and make a virtual contrast with cobwebs, highlighting the symmetry of cobwebs. Example 1: Get close to animals and enjoy life. Example 2: There is only one earth for human beings, but there are not only human beings on the earth! (The answer is not unique).

3. What mathematical knowledge do animals have?

The beehive is a hexagonal column of rock pigeons with a flat hexagonal opening at one end; At the other end, it is the bottom of a closed hexagonal diamond, which consists of three identical diamonds.

The obtuse rhombic angle that constitutes the site is 109 degrees 28 minutes, and all acute angles are 70 degrees 32 minutes, which is both firm and material-saving. The wall thickness of the honeycomb is 0.

073 mm, the error is very small. Red-crowned cranes always fly in groups, forming a "human" shape.

The angle of the herringbone is 1 10 degrees. More accurate calculation also shows that the angle of the herringbone is average, that is, the angle between each side and the direction of the crane group is 54 degrees, 44 minutes and 8 seconds! And the angle of the diamond crystal is just right, which is 54 degrees, 44 minutes and 8 seconds! Is it a coincidence or some "tacit understanding" of nature? The spider's "gossip" net is a complex and beautiful octagonal geometric pattern, and it is difficult for people to draw a symmetrical pattern similar to a spider's net even with the compass of a ruler.

Cats are small animals that people often see. Many people like kittens because they are cute. If you carefully observe the kitten, you will find that in winter, when the kitten sleeps, it always curls up into a sphere, which also has mathematical factors, because the sphere makes the cat's body surface area smallest, so it emits the least heat.

Coral can be said to be a natural mathematical "genius". Corals can write a "calendar" on themselves. They "draw" 365 stripes on their body walls every year, and of course, "draw" one a day.

However, paleontologists found that corals 350 million years ago "painted" 400 watercolors every year. Astronomers tell us that the earth is only 2 1 a day.

Nine hours, not 365 days a year, but 400 days.

4. What is the information about animal mathematicians?

There are many wonderful "animal mathematicians" in nature. Corals can write a "calendar" on themselves wonderfully: they "carve" 365 annual rings on the body wall every year, apparently drawing one every day. Strangely, paleontologists found that corals 350 million years ago "painted" 400 annual rings. It can be seen that corals can "calculate" and "record" the time of one year according to the changes of astronomical phenomena, and the results are quite accurate.

Every morning, when the sun rises to an angle of 30 degrees with the horizon, the "reconnaissance bees" among bees fly out of the hive to find the source of nectar, and report the orientation, distance and quantity of nectar with a unique "dance language" after returning. So the queen bee sent worker bees to collect honey. Strangely, the queen bee's "fuzzy mathematics" is quite accurate, and there are not many worker bees sent, just enough to eat, to ensure that they return to their nests to make honey.

Even more amazing is the "architect" of bees-worker bees. The nest they built is a strict hexagonal cylinder-a flat hexagonal opening at one end and a closed hexagonal cone at the other end, which consists of three identical diamonds. Interestingly, no matter what kind of beehive, all obtuse angles of the rhombus forming the chassis are equal to 109 degrees 28 minutes, and all acute angles are equal to 70 degrees 32 minutes. This data is exactly the same as that confirmed by mathematicians that "the largest diamond-shaped container needs the least materials".

Ants are also very good at calculating. British scientist Henston once did an interesting experiment: he cut a dead grasshopper into three pieces according to the volume of "4,2, 1". When the ants found these three pieces of food for 40 minutes, the ratio of the numbers gathered at the food end was exactly "4,2, 1".

The spider's gossip web is a complex and beautiful octagonal geometric pattern. Even with a ruler or compass, it is difficult for people to draw things like cobwebs.

When a cat sleeps in winter, it always hugs its body into a ball. There is math in it. Because the sphere minimizes the surface area of the body, it also gives off the least heat.

The mole is almost blind, but the tunnel it digs underground always turns 90 degrees.

Red-crowned cranes always migrate in groups in the shape of "human", and the included angle of this "human" shape is always 1 10 degrees. According to scientists, half the angle of the herringbone is exactly the angle of the diamond crystal. Is this a coincidence or a tacit understanding of nature? This is still a mystery.

5. Extracurricular knowledge about animals

Dog fish-the longest-lived fish has the highest IQ-the smallest bird-the hummingbird's most dangerous poisonous spider: the largest gecko funnel web spider in Sydney-the most biting animal of gecko-the marsupial, the Tasmanian devil king cobra-the most dangerous snake in the world, the shortest-lived vertebrate, the smallest animal goby-a protozoan with code H39, and the smallest bear in the world. The largest turtle in Guyana-the elephant turtle-the largest animal in the world-the blue whale is the longest-lived animal among mammals. It is said that it can live for 60 to 70 years. Of course, wild land is different from artificial farming, and the former has a shorter life span. According to records, the long-lived elephant in Golpagos Islands can live 180 to 200 years old. The fastest animal is the cheetah. It can run 1 10 km. Cheetah is a carnivorous cat, which preys on deer and antelope. When deer, antelopes and other animals run hard, the speed will not exceed 70 kilometers per hour, so they will be caught soon. But if the distance is not very short, the cheetah can't keep the fastest speed, so try to catch its prey as close as possible. The most powerful animal lion is called "the king of beasts", but it doesn't attack elephants. A few lions who attack baby elephants have never heard of being trampled to death by the mother elephant. However, some tigers that attacked elephants in India were trampled by elephants. It seems that the most powerful animal is the elephant. The cleverest animals and mammals are chimpanzees. There are apes similar to humans, gorillas belonging to the ape family in zoology, orangutans, gibbons and dark orangutans in Baltic countries. Among them, chimpanzees are the cleverest. Although its brain capacity is only 400 ml, it is not as good as 500 ml of gorilla. However, its brain function is particularly remarkable. Apart from insects, the shortest-lived animal is a mouse born in the Xiayi swamp in Hokkaido. It was born in spring and died the next day. Its life span is only eight to ten months. However, if fed indoors, it can live for two or three years. The heaviest animal is, of course. It is equivalent to five or six elephants. Elephants are divided into Indian elephants and African elephants. The former is relatively small, weighing about 4000 to 5000 kilograms, and the heaviest elephant is 8000 kilograms. African elephants weigh 6000 to 7000 kilograms, and the highest record is 12000 kilograms. The smallest sea crab, the bean crab living in Sagami Bay, Japan, is 3.8-4.2 mm, only as big as a grain of rice. The heaviest sea crab is found in bass strait. The largest lobster, weighing14kg, was caught by the deep-sea trawler "Hesper" on 1934. The weight from the tail end to the tong tip exceeds 65,438+09 kg. This big lobster is on display at the Boston Science Museum. The longest jellyfish was washed up on the beach in Massachusetts on 1965. If the tentacle is flattened, it is 74 meters long. The smallest lobster is the horned lobster in South Africa, with a total length of only about 10cm. The largest snail is the sea rabbit snail found on the coast of California, USA, with an average weight of 3.2-3.6 kg and the heaviest weight of 6.8 kg. The height of the largest snail shell is generally more than 20 cm, and the maximum is 40 cm. The most valuable shellfish experts believe that white-toothed agate shells living overseas in the Philippines are rare and precious. So far, three of them have been found. 1975 1 1 was captured on macri Island overseas and sold to the Japanese for $7,000. Among the marine animals that breathe with their lungs, the turtle that holds its breath for the longest time underwater is one breath. You can stay downstream for days and nights. The most destructive insects are grasshoppers distributed in Africa and West Asia. Some weather conditions will cause swarms of grasshoppers to devour almost all plants encountered during the flight. The crops eaten by 50 million grasshoppers a day can feed 500 people a year. The fiercest birds live in the Andean vultures between the cliffs of the Andes in South America. Its body length can reach1.2m, and its wings can spread up to 3m. It has a strong and hooked "iron mouth" and sharp claws, and specializes in eating live animals, not only small and medium-sized animals such as deer, sheep and rabbits, but also large mammals such as cougars. Therefore, it is also called "the bird that eats the lion" and "the king of birds". The biggest animal among other animals: the blue whale _ _ the longest-lived animal: the turtle _ _ the tallest animal: the giraffe _ _ the animal with the most feet: the millipede _ _ the swimming champion among other animals: the dolphin _ the ship in the desert: the camel. The biggest land animal: the elephant _ _

The first half of this article tells a legendary story about the origin of the word "sloppy", which is very interesting. However, the second half of the article said: "There are indeed animals called' slovenly' in the animal kingdom.

It grows on Baima Mountain at the junction of eastern Sichuan and Guizhou, and villagers call it' careless tiger'. This rare animal is as big as a horse and looks like a horse. Its surface has a striped pattern similar to that of a tiger, which is more fierce than a tiger. It's secretive and swift, with sharp front paws. It specializes in hunting wild animals and cattle and sheep raised by mountain people.

Legend has it that the tiger on Baima Mountain was accidentally eaten. This passage sounds mysterious, but in fact, this animal named "Sloppy" is just an animal in folklore or science fiction stories. Like "Savage", it doesn't exist in the real world at all.

At present, all animal species in the world are the products of millions of years of long evolution, and all have historical traces of their origin and development. Let's look at the evolutionary history of horses first.

Horses belong to strange-hoofed animals. Today, there are horses, donkeys, tapirs and rhinoceroses in the world, all of which are large herbivorous ungulates, and there are about 6 genera 17 species in the world. Although their shapes are different, they all have a big middle toe to support their bodies, and even if there is a small side toe, it does not support their weight.

The upper part of the talus of the hind foot forms a pulley, which can only bend in one direction, and its running ability is not as good as that of cloven-hoofed animals who also eat grass. Except for the forefoot of tapir, the number of toes is odd.

There are hooves on your toes to help you walk. They inhabit grasslands or forests.

6. What animals' living habits are related to mathematics?

Bees When we observe the beehive, we are surprised to find that it is a standard hexagonal cylinder with a flat hexagonal opening at one end and a closed hexagonal pyramid bottom at the other end, which consists of three identical prisms. The measurement results show that all obtuse angles of the prism forming the chassis are 109 degrees 28 minutes, and all acute angles are 70 degrees 32 minutes, which is both firm and material-saving. The thickness of the honeycomb wall is. The error is very small. Scientists have done some interesting experiments and found that bees have their own "fuzzy mathematics". They fly out every morning, and when the "scout" comes back, he tells the location, distance and nectar amount in "dance language", so the queen bee "sends" worker bees out to collect honey. Strangely, all the worker bees can just eat enough and go back to the nest to make honey. Spiders form a "gossip" with their silks. Not only the structure is complex, but also the shape is beautiful and amazing. Even with rulers and compasses, it is difficult for a master painter to draw a pattern as symmetrical as a spider's web. In winter, cats always hold their bodies together to keep warm from the cold. Knowledge of geometry is also used here. Because the ball can minimize the surface area of the body, the heat emitted is minimal. Red-crowned cranes always fly in groups. Arranged in a neat herringbone, and the angle of this herringbone is constant, which is 1 10 degrees. More interestingly, the half angle of the herringbone (the angle between each side and the crane group direction) is 55 degrees, 44 minutes and 8 seconds, which is exactly the same as the angle of the diamond crystal. Coral says algebra. " This is necessary. It "draws" 365 circular stripes on its body every year, which is obviously one a day. Studies by paleontologists have confirmed that corals 350 million years ago are different from today's, with as many as 400 annular stripes every year. It turns out that according to the calculation of astronomers, there were only 265438+ on the earth at that time.

7. What animals' living habits are related to mathematics?

Bees When we observe the hive of bees, we are surprised to find that it is a standard hexagonal cylinder with a flat hexagonal opening at one end and a closed hexagonal pyramid bottom at the other end, which is composed of three identical prisms. The measurement results show that all obtuse angles of the prisms forming the chassis are 109 degrees 28 minutes, and all acute angles are 70 degrees 32 minutes, which is both firm and material-saving. The honeycomb wall thickness is 0.073 mm, and the error is very small. Scientists have done some interesting experiments and found that bees have their own "fuzzy mathematics". Every morning, the scout who flew out came back and told the location, distance and nectar amount in "dance language", so the queen bee "sent" worker bees out to collect honey. Strangely, all the worker bees can just eat enough and go back to the nest to make honey.

The spider's gossamer-like web made of spinning silk is really wonderful. This octagonal geometric pattern is not only complicated in structure, but also beautiful in shape and breathtaking. Even with rulers and compasses, it is difficult for a master painter to draw a pattern as symmetrical as a spider's web.

In winter, cats always hold their bodies together to keep warm from the cold. Geometry is also used here, because spheres can minimize the surface area of the body, so they emit the least heat.

Red-crowned cranes always fly in groups and form a neat herringbone. Moreover, the angle of the herringbone always remains the same, which is 1 10 degrees. More interestingly, the half angle of the word "human" (the angle between each side and the direction of the crane group) is 55 degrees, 44 minutes and 8 seconds, which is exactly the same as the angle of the diamond crystal.

Coral is no exaggeration to say that it is the "champion" of algebra. You see, coral's "calendar" written on himself is a must. Every year, it "depicts" 365 circular stripes on its body, apparently one a day. Studies by paleontologists have confirmed that corals 350 million years ago are different from today's, and as many as 400 annular stripes are "portrayed" every year. It turns out that according to the calculation of astronomers, the earth was only 2 1.9 hours a day at that time, so the time of a year was not 365 days, but as many as 400 days.

8. A little knowledge about mathematics

It is very difficult for pupils with poor grades to learn primary school mathematics. In fact, primary school mathematics belongs to basic knowledge, and it is relatively easy to master as long as you master certain skills. Primary school is a time to develop good habits, so it is very important to cultivate children's habits and learning ability. What are the skills of primary school mathematics?

First, pay attention to the lecture in class and review it in time after class.

The acceptance of new knowledge and the cultivation of mathematical ability are mainly carried out in the classroom, so we must pay special attention to the efficiency of classroom learning and find the correct learning methods. In the classroom, we must follow the teacher's thinking and actively formulate the following steps to think and predict the difference between the problem-solving thinking and the teacher. In particular, we must understand the basic knowledge and basic learning skills, review them in time, and avoid doubts. First, before all kinds of exercises, we must remember the teacher's knowledge points, correctly understand the reasoning process of various formulas, and try our best to remember instead of using "uncertain books to read". Be diligent in thinking, try to think about some problems with your brain, carefully analyze the problems, and try to solve them by yourself.

Second, do more exercises and form a good habit of solving problems.

If you want to learn math well, you need to ask more questions and be familiar with all kinds of problem-solving ideas. First of all, we practice the basic knowledge repeatedly according to the topic of the textbook, and then find some extracurricular activities to help broaden our thinking practice, improve our analytical ability and master the law of solving problems. For some problems that are easy to find, you can prepare a wrong book for collection, write your own ideas for solving problems, and develop a good habit of solving problems in daily life. Learn to keep yourself highly focused.

Third, adjust the mentality and treat the exam correctly.

First of all, the main focus should be on the foundation, basic skills and basic methods, because most exams are based on basic questions, and the more difficult questions are also based on basic questions. Therefore, only by adjusting the learning mentality and trying to solve problems with clear ideas will there be no too difficult problems. Practice more exercises before the exam, broaden your mind, and improve the speed of doing the questions on the premise of ensuring accuracy. Simple basic questions should be grasped with 20 points. Try to do the right thing on rare topics, so that your level can be normal or extraordinary.

It can be seen that the skill of primary school mathematics is to do more exercises and master basic knowledge. The other is mentality, and it is very important to adjust mentality. So you can follow these skills to improve your ability and enter the ocean of mathematics.

9. Scientific knowledge about animals

swallow

They breed in the northern hemisphere in spring and migrate to the south (Africa and Australia) in winter. Although it is difficult for children living in Shenzhen to see swallows, in some areas in northern China (such as northeast and northwest), swallows are seen flying back to their hometown from the south every spring, just as the song goes.

There are also many birds, such as house swallows, which change their habitats over long distances seasonally and periodically. This habit is called bird migration, and migratory birds are called migratory birds.

Mountain mouse

Some Canadian mountain rat hibernated for half a year. When winter comes, they dig tunnels, get into caves and curl up. Their breathing gradually slowed down to almost stop, their pulse correspondingly became extremely weak, and their body temperature plummeted to 5℃. At this time, even if you kick it, there will be no reaction, just like death, but it is actually alive.

squirrel

Squirrels sleep more dead. Someone once dug a hibernating squirrel out of a tree hole, and its head seemed to be broken. No matter how you shake it, you won't open your eyes, let alone walk. If you put it on the table, you can't wake it up with a needle. Only by heating it with a stove can it move leisurely and for a long time.

snail

Snails seal their shells with their own mucus.

frog

It is a cold-blooded animal. The body temperature of cold-blooded animals will be affected by temperature. As the temperature gets colder, their body temperature will gradually drop. When the temperature drops to a certain extent, some animals will freeze to death. In order to survive, cold-blooded animals like frogs got into the soil and were in suspended animation to avoid the cold, and then came out after the ground temperature rose in the next spring. This is why frogs hibernate.

10. A little knowledge about mathematics

Small knowledge of mathematics

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The origin of mathematical symbols

Besides counting, mathematics needs a set of mathematical symbols to express the relationship between number and number, number and shape. The invention and use of mathematical symbols are later than numbers, but they are much more numerous. Now there are more than 200 kinds in common use, and there are more than 20 kinds in junior high school math books. They all had an interesting experience.

For example, there used to be several kinds of plus signs, but now the "+"sign is widely used.

+comes from the Latin "et" (meaning "and"). /kloc-in the 6th century, the Italian scientist Nicolo Tartaglia used the initial letter of "più" (meaning "add") to indicate adding, and the grass was "μ" and finally became "+".

The number "-"evolved from the Latin word "minus" (meaning "minus"), abbreviated as m, and then omitted the letter, it became "-".

/kloc-In the 5th century, German mathematician Wei Demei officially determined that "+"was used as a plus sign and "-"was used as a minus sign.

Multipliers have been used for more than a dozen times, and now they are commonly used in two ways. One is "*", which was first proposed by the British mathematician Authaute at 163 1; One is "",which was first created by British mathematician heriott. Leibniz, a German mathematician, thinks that "*" is very similar to Latin letter "X", so he opposes the use of "*". He himself proposed to use "п" to represent multiplication. But this symbol is now applied to the theory of * * *.

/kloc-In the 8th century, American mathematician Audrey decided to use "*" as the multiplication symbol. He thinks "*" is an oblique "+",which is another symbol of increase.

""was originally used as a minus sign and has been popular in continental Europe for a long time. Until 163 1 year, the British mathematician Orkut used ":"to represent division or ratio, while others used "-"(except lines) to represent division. Later, in his book Algebra, the Swiss mathematician Laha officially used "∫" as a division symbol according to the creation of the masses.

/kloc-in the 6th century, the French mathematician Viette used "=" to indicate the difference between two quantities. However, Calder, a professor of mathematics and rhetoric at Oxford University in the United Kingdom, thinks that it is most appropriate to use two parallel and equal straight lines to indicate that two numbers are equal, so the symbol "=" has been used since 1540.

159 1 year, the French mathematician Veda used this symbol extensively in Spirit, and it was gradually accepted by people. /kloc-In the 7th century, Leibniz in Germany widely used the symbol "=", and he also used "∽" to indicate similarity and ""to indicate congruence in geometry.

Greater than sign ">" and less than sign "