Summer life answers for seventh grade! ! ! Bonus points for some!

Answers to Shandong Province's 2010 "Summer Life Guidance"

Beginning,

p4 Food Civilization:

1. Do not follow the rules after entering the restaurant Make loud noises, be civilized and polite, and create an elegant and healthy dining environment. Observe the dining order, avoid crowding and booing, and line up to buy meals by swiping your card in sequence.

2. Do not drink, punch, smoke or do anything that affects others’ dining in the restaurant.

3. Consciously maintain environmental hygiene and refrain from spitting, littering, and dumping leftovers into vegetable basins or buckets.

4. Take good care of restaurant facilities, equipment and tableware, and do not misappropriate or use them for other purposes.

5. Plan meals diligently and frugally, and do not waste a grain of food.

6. After finishing the meal, put the tableware in the designated place or hand it to the staff.

7. Respect the restaurant staff. If you are dissatisfied with the staff's service, you can report it to the restaurant management in a timely manner and do not insult or even beat or scold the staff.

8. If there are any problems during dining (food quality, hygiene, etc.), please find relevant personnel or departments to solve them.

Civilized accommodation:

1. Consciously implement the school’s regulations on student dormitory management, obey the management of staff, and respect the work of staff.

2. The spiritual life in the dormitory should be healthy and the words and deeds should be civilized.

3. Do not use other people’s belongings without their consent.

4. Pay attention to cleanliness

5. Be hardworking and plain, diligent and frugal

6. Strictly abide by the work and rest system and live on time.

7. Non-dormitory personnel are not allowed to stay in the dormitory. 8. Do not engage in various business activities in the dormitory.

9. Do the "ten don'ts" in the dormitory (no pasting, no graffiti, no pulling ropes, no hanging bed curtains, no nailing hooks, no tearing down, smashing, kicking, or throwing furniture) * Facilities and equipment must be maintained, and beds, cabinets, and luggage racks must not be moved without authorization). 10. Protect public property.

11. Be vigilant against fire and theft.

p5. Perseverance in a great cause requires an unswerving spirit. ——Voltaire

2. The interests of the public and the welfare of mankind can make hateful work valuable. Only enlightened people can know the enthusiasm required to overcome difficulties. ——Anonymous

3 In the duel between hope and disappointment, if you hold it tightly with courage and determination, victory will definitely belong to hope. ——Pliny

4. All a person can do is to set a good example and have the courage to firmly uphold ethical beliefs in a gossipy society. ——Einstein

p6

Noisy venting method. When you are frustrated, unhappy or depressed, you can run like crazy or do other challenging work, or you can find a close friend to talk to. But be sure not to keep it in your heart, because that is not good for your body.

Transfer method. When one door closes, another one opens to you, so don't be frustrated, just observe and discover. Besides, the goal still exists, it’s just that this road is temporarily impassable due to construction. What you should do is to find another road and continue moving forward. Don’t forget that you can reach the same destination by taking different paths!

p7 The conflict is caused by both parties. For parents, we must be considerate of their intentions, see more of their strengths, and understand their difficulties; for ourselves, we must have strict requirements from multiple perspectives such as family affection, morality, and responsibility, and overcome problems such as willfulness and stubbornness. It is necessary to help students weigh the pros and cons, foresee the different consequences of different attitudes and behaviors, and deal rationally with problems encountered in interactions with parents.

The fundamental way to prevent Internet addiction is to use wisdom in real life to make yourself live a good life. We believe that the root cause of the problem of Internet addiction comes from the fact that modern people lack certain knowledge and abilities to meet basic human needs. They cannot control real life, so they must use the virtual world to make up for the shortcomings that cannot be satisfied in reality.

Chinese

1.2. Skip

(2) History" means historical records,

This goes back to before the invention of paper At that time, the ancients used "bamboo slips" to record events, that is, they used good bamboo to write down things and articles. The pieces of bamboo were called "bamboo slips". Green bamboo (this "green bamboo" refers to green bamboo) is called "green"; then, it is cut into rectangular bamboo slices, and then the pieces of green bamboo are baked with fire. On the one hand, it is for the convenience of writing, and on the other hand, it is also for the convenience of writing. Drying to prevent insects. During baking, the originally fresh and moist green bamboo slices are baked until water droplets appear, as if they are sweating. This process of baking green bamboo is called "history". The original meaning of "history" is green bamboo. The process of sweating has gradually become synonymous with bamboo slips.

Judging from the unearthed ancient bamboo slips, long bamboo slips are often used to write Confucian classics; short bamboo slips are often used to record the deeds and historical biographies of various scholars. Therefore, the name "history" of bamboo slips evolved, and people conveniently called it "historical records" recorded on bamboo slips.

Taoli. According to the Han Dynasty's "Han Shi Wai Zhuan", in the Spring and Autumn Period, the state of Wei had. There was a minister named Zi Zhi, who had sponsored many people when he became powerful. Later, he lost his official position and ran to Beijing alone. He met a man named Jian Zi and complained to him, complaining that the people he had trained in the past refused to do so in times of crisis. Help him. After hearing this, Jianzi smiled and said to Zizhi: If you plant peach and plum trees in spring, you can rest under the trees in summer, and you can also eat delicious fruits in autumn. However, if you plant tribulus in spring. , its leaves cannot be used in summer, and the thorns it grows in autumn will hurt people. The people you trained and promoted in the past were all unworthy of recommendation, so a gentleman cultivates talents just like planting trees. You should choose the target first and then cultivate it!

The ancient Chinese term refers to the age of seventy. It originated from the poem "Qu Jiang Er" by the great poet Du Fu of the Tang Dynasty. Du Fu said: "Seventy years are rare in life. "Du Fu, who lived more than 1,200 years ago, lamented that life is short, and those who can live to the age of seventy have been very rare since ancient times.

The comfortable nest comes from Shao Yong of the Song Dynasty's "Unknown Public Biography": "The room where he sleeps" It is called a comfortable home, not seeking perfection, but seeking warmth in winter and coolness in summer

Rip-off In the late Qing Dynasty, opium smuggling was very serious. In order to avoid checkpoints, smugglers went to great lengths to hide opium. Water smugglers hide drugs in bamboo boat poles and transport them to various places via waterways. One day, a merchant ship sailed to the dock in Shaoxing, Zhejiang Province. The anti-smuggling officer took people on board to inspect. They searched every corner of the cabin and found no opium. At this time, a master smoked a long chimney and casually walked to the stern of the boat. He knocked ashes on the bamboo poles supporting the boat, making a "beep" sound. No one else responded, but the captain's face changed with fright. Knowing that the master had seen through the secret, he hurriedly invited the master to the back cabin, took out a large amount of money and quietly handed it to him, asking him to please take care not to knock the pennies again. When the master got the money, he didn't say anything and followed the police officers off the boat. Since then, "extortion" has become synonymous with extorting property and has been used ever since.

There is another theory about the origin of "rip-off": In the mountainous areas of Sichuan, rich people ride on a sliding pole made of bamboo poles when they go to burn incense. The sliding pole is carried by people. When they got halfway up the mountain, the person carrying the slider knocked on the slider and asked for processing money, otherwise he wouldn't be lifted, and the person riding the slider had to pay more.

There is another saying: In the late Qing Dynasty, small transactions in the market were conducted in copper coins. After the shopkeeper took the money, he threw it into a money tube made of bamboo sticks, and poured it out when checking out at night. This is called "Inventory of money" is also called "inventory". At that time, there was a store in Shanghai. The owner was very dishonest. When strange customers came in, he would often raise the price at will. Whenever a waiter was waiting for a customer, the shop owner would extort money and signal to increase the price.

(3)

Used when expressing full confidence (nine out of ten)

Used when someone has a small calculation (little ninety-nine)

It is used when someone is doing things quickly (three times five divided by two)

It is used when two people share the same thing equally (two one plus five)

It means it is real and cannot be changed When it is used (one means one, two means two)

It means that something is done without considering it, and it will be said after it is done. When it is used (one is not done, two is endless)

(4)

Scallions mixed with tofu - one green (clear) and two whites

The monk's residence - the temple (wonderful)

Wash Coptis chinensis by the river - the river (he) is bitter< /p>

There is a fire in the lotus pond - the lotus root (occasionally) burns (ranly)

Planting pine trees in the flower pot - it will not become a material (talent)

Holding a grate in my arms —— Comb (soothe) the heart

The water of the Yellow River——difficult to clear (please)

The blind man enters the opium den----------Modern. (Touch the lamp).

Bag in the air------------pretending to be crazy. (pretend to be cool).

Song Jiang’s military advisor is useless. (Wu Yong).

The old woman went to the henhouse----Idiot. (Bendan).

The straw hat seller throws his pole------be careful. (leave the rope).

My brother is not at home----------Don't come. (Sister-in-law comes).

My nephew is lighting a lantern----------as usual. (Uncle Zhao).

The rain hits the yellow plum head----------unlucky. (fallen plum).

Half a tael of cotton------------No need to discuss. (no bullet required).

The bald man holding an umbrella is lawless. (No hair, no sky).

El Chapo Transition------------Peace of mind. (Yan Xin).

Buying pigs in the horse shop----------nothing like that. (Not that city).

The weather in the twelfth lunar month is ------------handy. (frozen hands and frozen feet).

It is unreasonable for a father to kowtow to his son. (How can there be such a gift).

The public toilet is still stone------causing public outrage. (causing public feces).

Wearing a leather jacket backwards----------pretending. (pretending to be a sheep).

Confucius moving ---------- is a net loss. (It’s just a book).

Pregnant women take risks by walking on a single-plank bridge. (Take risks).

Grandma died and her son was helpless. (no uncle).

Husband slaps a fan------------Desolate. (Wife Liang).

The scholar’s ??towel----------guaranteed loss. (Book included).

The turtle climbs the threshold----------but look at this. (But look at this translation).

It’s not surprising that towels are still the pick of the needle. (Not enough for a flag).

A dull knife breaks a bamboo ------- I can’t think about it. (It won’t ring).

Tie chicken feathers to telephone poles------How brave. (What a big duster).

Cracking melon seeds will bring out bedbugs------everyone has them. (There are all kinds of benevolence).

Dengcao plays the drum------------I don’t want to. (no sound).

Lamp grass crutches------------can't make the decision. (Can’t do the leaning).

Chatting in the salt shop----------I have nothing to do. (too salty to do anything).

Zhang Tianshi did not use a boat to cross the sea - he had his own rules. (Have your own way to cross).

Blowing the trumpet through the window----------famous. (The sound is outside).

The Dragon King moved----------Awesome. (off the sea).

Lao Jiu’s brother----------honest. (Old Ten).

Buried in an empty coffin----------arrogant. (There is no one among the trees).

Jie Yuan----------rules in Wang Ba Zhong. (guiju).

Wear gloves in June----conservative. (Guard your hands).

Raw peanuts--------------noisy. (It must be fried).

The cobbler does not bring an awl - that's fine. (Needle row).

It is just right for a girl from the He family to marry the Zheng family. (Zheng Heshi).

The monk’s house----------temple. (wonderful).

Wash the yellow lotus by the river----------Why bother. (River is bitter).

Blind people wear glasses----------pretending to be smart. (False and false).

Dreaming about becoming a butterfly----------Fantasy. (Thinking of Feifei).

Monkey learning to walk----------hypocritical. (Fake orangutan).

Hardcover Maotai------------Long time. (Good wine).

The spider pulls the web------------selfishly. (from silk).

The blind man carries the blind man on his back----------He is getting busier and busier. (Blind on top of blind).

Long live my nosebleed---- it's red. (I am red).

Break the casserole------------Ask the end. (Tattoo to the end).

Take a walk in the watermelon field---it's all right. (Left and right are circles).

Take off the old shoes and replace them with new ones------change the evil and return to the right. (Change your shoes to make things right).

Sack bags and grass bags------the bags are inferior to each other. (One bag is not as good as one bag).

The beans at the bottom of the bowl are vividly visible. (Every particle is in the eye).

Selling cloth without a ruler----------has bad intentions. (Without intention).

Folklore

Everything is included - an advertisement for a dumpling restaurant

"Everything is included" originally means that nothing is not included. That is to say, it means to include all things, and the word "bao" in it means "to be contained inside". This advertisement is used to refer to the "bao" used to make dumplings, making the semantic connection of this polysemous word very reasonable.

(5)

The east wind breaks. Every sentence has a rhyme

(6)

There was a rich man, and his father and his son each donated money to a Jinshi. , felt very proud, and posted a couplet in front of the door to celebrate New Year's Eve. The couplet says: The father is a Jinshi, the son is a Jinshi, the father and the son are Jinshi together; the wife is a wife, the daughter-in-law is a wife, the wife and daughter-in-law are both wives. After reading it, the talented man Wang added a few strokes to the couplet, and the couplet suddenly became: father goes to the earth, son goes to the earth, father and son go to the earth together; the wife loses her husband, the daughter-in-law loses her husband, the wife and daughter-in-law both lose their husbands. The rich man was so ashamed and angry that he had to tear off the couplet.

(7)

口

日

(8)

The emblem pattern resembles the Chinese character "世" , and cleverly combined with the number "2010" to complement each other, expressing the strong desire of the Chinese people to hold a world-class, multi-cultural expo event.

The image of the emblem is like a family of three hugging each other and enjoying each other, which expresses the harmony of the family. In a broad sense, it can represent all mankind including "you, me and him", and expresses the concept of "understanding, communication, gathering and cooperation" of the World Expo.

The emblem uses green as the main color, full of life and vitality, adding upward, rising and bright dynamics and connotations, expressing the Chinese people's creative passion for the future and pursuing sustainable development.

(1)

1. The word "break willows" first appeared in the first chapter of the Han Dynasty Yuefu's "Song of Breaking Willows": Mount the horse without catching the whip, and bend the willow branches instead. Therefore, Zheliu is the name of a piece of music, so "Zheliu is heard in the song".

The word "break willow" means "seeing farewell and cherishing the distance":

In ancient my country, once relatives and friends separated, the sender would always break a willow stick and give it to the person far away. Walker. The word "Zheliu" means "farewell". Our country's custom of "breaking willows to see off" was first seen in "Xiaoya; Picking Wei" in my country's first collection of poems, "The Book of Songs": "In the past I left, and the willows clung to them; now I come to think about them, and the rain and snow are falling." In ancient times, the willow tree was also called Xiaoyang or Yangliu. Because "Liu" and "Liu" are homophonic, it can mean to stay. Giving a willow as a parting gift expresses the inseparability, the inability to bear to say goodbye, and the reluctance to leave.

2. After this change, the sentence is much more concise. However, the unique artistic conception of rural Qingming composed of the four images of "busy", "on the road", "asking" and "shepherd boy" in the original poem has also been destroyed.

Therefore, from the perspective of refining the sentence, the modification is successful; from the perspective of refining the artistic conception, the modification is a failure.

3. The sentence that speaks directly from the heart is: I hate you so much, my hatred is at the end of the world.

2. The last three sentences describe the scenery, contrasting the ruthlessness of mountains, moon, feng shui, falling flowers and blue clouds with the sentiments of "thousands of hatreds" and "inner matters" to highlight the resentment and resentment in the heart of the missing woman. sad.

(2)

1 We should learn from Bing Yuan his spirit of not losing ambition in poverty and determination to study and his spirit of hard work and diligence in learning.

What deserves our admiration for the teacher in the school is his spiritual charm of exempting Bing Yuan’s tuition, teaching regardless of remuneration, and selfless dedication to the next generation.

2. Contempt

Resentment

. If you harm yourself by studying like this, it is better not to study.

You must never be satisfied when learning, be humble in life, and avoid arrogance

3. Of

to

Now that you have deceived him, this It is to educate children to deceive people

Be honest and do what you say. You must always do what you promise to others

(3) Daddy Xu

(4) Andersen's world is so rich and magical, full of poetry and fairy tales, full of love and touching , full of beauty and tragedy. This world has a fascinating and addictive magic. It can keep us far away from the secular world, but also be understood intimately by us; it can make us hear the footsteps of God from outside the sky, and it can make us feel ourselves. footsteps. In a sense, the sun of world children's literature rises from the horizon of Denmark in Northern Europe. The warm human beauty, artistic beauty, and fantasy beauty contained in Andersen's fairy tales have warmed and illuminated the hearts of generations of young readers and even older readers around the world. Classics are timeless and always new when read, and so is the fairy tale art world created by Andersen. Andersen's fairy tales will continue to be read and accepted by young children. In this sense, Andersen is immortal.

Extended reading

1. The kind of person that comes to mind

2. Regret, guilt, sadness, bravery and persistence

3. Jia Jia: So happy , Xiaoqiang finally changed back. I won’t do such stupid things in the future. Xiaoqiang is my good friend no matter what. He always helps me. When others bully me, he comes to my rescue, but he himself gets beaten. What a great classmate.

Zhang Xiaoqiang: I’m so happy, so ashamed. I shouldn’t have treated Jia Jia like this. Although she turned me into a puppy, she was also very anxious to help me find a way to change me back. She even wanted to accompany me. I turned into a puppy. What a good classmate. I will never do any pranks again.

(5)

1. I thought he was a selfish child

It was disrespectful to life

2. The cruelty of time

The shortness of life

There is a kindness that can never be repaid in the world

Life itself is vulnerable and fragile.

3. If you hurt others, you cannot make up for it; if something is broken or lost, you can make up for it. Generally, what can be compensated is material, and what cannot be compensated is spiritual.

4. Agree. Because he doesn't even love the mother who gave birth to him and raised him, then it's even less possible for him to love other people.

(6)

1. Be a good and educated student!

2. Books are mankind’s best friends!

Reading a good book will allow you to gain a lot of knowledge in the process of reading. Use the summer vacation to read some extracurricular books to make your life more fulfilling and happy. Be a good and educated student.

(1)

What to say when we first meet (Long time admirer)

Long time no see (Long time no see)

Ask someone to criticize (Advice)

Asking for forgiveness (forgiveness)

Asking for help (reeducation through labor)

Asking for convenience (borrowing light)

Please tell others (Excuse me)

Congratulations to someone (Congratulations)

Ask someone to read the manuscript (Correction)

Ask someone to answer my question (Ask for advice)

Asking for advice (enlightenment)

Asking for help (please) (2)

1: A. If you drink, you will not be thirsty. If you are thirsty, you will drink. If you drink, you will not be thirsty. , you must drink when you are thirsty. If you are thirsty, you must drink. If you don’t drink, you will be thirsty. If you are thirsty, you must drink. The more you drink, the thirstier you will be.

B. When you are thirsty, you need to drink water in one gulp.

You can only quench your thirst if you have water.

You can drink with your mouth.

2: Eye means eye, Qing means Qing. There is a horizontal difference between the two characters, and the radical of Qing is Three points of water is very different from the two characters.

(3)

Boy: If it’s less, wouldn’t it be easier for you to count?

(4)

1. Eat, fish and sing karaoke in the walnut orchard on the bank of the Yellow River

2. The countryside is the green world for you and me! ! Happy farmhouse, happy pastoral, and a happy civilization! A piece of sincerity, concern for green space, a piece of true love, concern for health. Throwing a piece of garbage does not mean fertilizing! Breaking a flower does not mean grafting!

Mathematics

1.

1.×

2.√

3.√

II.

1.B

2.B

3.B

4.D

5.A

3.

1. ∠BCE = ∠ABC

2. 55° south by west

3. Substitute equal equivalents for vertex angles and equivalent substitutions for straight angles Substituting supplementary angles with equal amounts for straight angles

4.25

IV.

1. Solution: ∵∠2＋∠3=180°

∴a∥b (the interior angles on the same side are complementary and the two straight lines are parallel)

∵∠3=∠4

∴c∥d (the same angles are equal and the two straight lines are parallel)

∵a∥b

∴∠3=∠1=60° (the two straight lines are parallel and have equal angles)

∵∠3＋∠5=180°

∠3=60°

∴∠5=120°

2. Skip

3. The proof is as follows:

∵AB⊥BC

∴∠ABC=90°

∵BC⊥CD

∴∠BCD=90°

∵∠ABC=90°∠BCD=90°

∵∠BCD=∠ABC ∠1=∠2 ∠2＋∠FBC=∠ABC ∠1＋∠BCE=∠BCD

∴∠FBC=∠BCE

∵∠FBC=∠BCE

∴BF∥CE (the internal offset angles are equal and the two straight lines are parallel)

4. Solution: AB∥CD

The reason is as follows:

∵BE bisects ∠ABD

∴∠ABD=2∠1

∵DE Bisect ∠BDC

∴∠BDC=2∠2

∵∠1＋∠2=90°

∴∠ABD＋∠BDC=180°

1. Straight lines perpendicular to the same straight line are parallel

2. Draw perpendicular lines

If the lengths of two perpendicular lines are equal, they are parallel

3. Use the equal internal angles of parallel lines: the two mirrors are parallel, so 90-∠2=90-∠3, so ∠2=∠3, then ∠1+∠2=∠3+∠4, That is, the internal angles of the entering ray and the leaving ray are equal, so they are parallel

一.

1.√

2.×

3.√

4.×

二.1.A

2.D

3.A

< p>4.B

5.B

6.D

7..B

8.D

9.B

Three.

1.3 6

2.Second

3.-1

4.10

5. The time for A to chase B is 11.25 hours.

It takes 4.5 hours to meet

It takes 12 hours for A to chase B

6.

Equation 32 (x+y)=400

180(x-y)=400

7.10

8. Because the two values ??are different, one number is negative

When x is a negative number, x+y=4|x|+|y|=-x+y=7

The solution is x=-1.5 y=5.5 x-y=-7

When y is a negative number, x+y=4|x|+|y|=x-y=7

x=5.5 y=-1.5 x-y=7

Four .

1. Omitted

2. Omitted

3. If the rectangle ABCD is in AB=6, AD=4. Then take a point E on AB to make AE=2; take a point F on AD to make AF=1. Draw parallel lines EM and FN of AD and AB respectively through point E and point F, intersecting at point O, that is, O is the origin, EM is the x-axis, FN is the y-axis, then the coordinates of point D are (-2, -3) .

The coordinates of the other three points are A(-2,1), B(4,1), and C(4,-3).

4. Substituting x=2 and y=1 into the two formulas respectively, we have

2a+b=3,2b+a=7

Solving this linear equation of two variables, we get, b=11/7,a=5/7

5.4x+3y=7(1)

kx+(k-1) y=3(2)

x=y(3)

Because x=y is substituted into (1)

7x=7y=7

So x=y=1

Substitute (2)

k+k-1=3

2k=4

k=2

6. x=3, y=4 wait for a1x+b1y=c1, a2x+b2y=c2, there is

3a1+4b1=c1

3a2+4b2=c2 (1)

3a1x+2b1y=5c1

3a2x+2b2y=5c2

Dividing both sides of the system of equations by 5, we have:

3/5a1x+2/5b1y=c1

3/5a2x+2/5b2y=c2(2)

Compare the equations (1) and ( 2)

There are 3x/5=3 2y/5=4

So x=5, y=10

7. Assume the speed and length of the train They are v, s

80s/v=45

800-s/v=35. The solution is v=20 s=100

1. Solution: 1. Suppose it is planned to build a new school building with X square meters, then the demolished school building will be 7200- %)(7200-X)=7200

8X+11(7200-X)=72000

3X=79200-72000

X=2400

p>

School buildings planned to be demolished: 7200-X=7200-2400=4800 (square meters)

Answer: The planned area of ??new school buildings and demolished school buildings are 2400 square meters and 4800 square meters respectively.

2.

Funds planned to build new school buildings: 700*2400=1,680,000 (yuan)

Funds planned to demolish school buildings: 80*4800=384,000 (yuan)

Funds planned for new and demolished school buildings***: 1,680,00384,000=2,064,000 (yuan)

Actual funds for new school buildings: 80%*2400*700= 1,344,000 (yuan)

Actual funds used to demolish school buildings: (1+10%)*4800*80=42,240 (yuan)

Actual funds used to build and demolish school buildings** *:1344004240=1386240 (yuan)

The money saved is: 2064000-1386240=677760 (yuan)

The area of ??the money saved for greening: 677760/200= 3388.8 (square meters)

Answer: In the actual completed demolition and construction project, the remaining funds used for greening were 3388.8 square meters.

2. Solution: Assume Type I before activity The number of refrigerators is Get x=560

Type I refrigerator: 560 units

Type II refrigerator: 400 units

(2) Type I refrigerator: 560* (1+30 %) = 728 units

Type II refrigerator: 1228-728=500 units

13% (728*2298+500*1999)

≈3.5* 10 to the fifth power

3. Suppose we need to use 8m water pipes X and 5m water pipes Y

8X+5Y=132

Because 132-8X It is a multiple of 5, so the mantissa of 8X is 2 or 7 (the mantissa of 7 is an odd number, it will not be a multiple of 8, and the mantissa 7 is not considered)

So the mantissa of X is 4 or 9, and X ≤132/8=

16.5

So there are three options for /p>

9 strands for 8m and 12 strands for 5m

14 strands for 8m and 4 strands for 5m

Because the unit price of 8m is 50/8 yuan/M

So it is the most economical to choose the solution with the most 8m pipes, that is, choose 14 8m pipes and 4 5m pipes

1. Solution

< p>The price of each pear: 11÷9＝12/9 (text)

The price of each fruit: 4÷7＝4/7 (text)

The number of fruits :

(12/9×1000-999)÷(12/9-4/7)=343 (pieces) Number of pears: 1000-343=657 (pieces) Pears Total price:

12/9×657＝803 (text)

Total price of fruit:

4/7×343＝196 (text)

Solution: Suppose the pear is ：X=657; 7=196

2. Solution: Suppose there are x birds on the tree and y birds under the tree. From what is known, we get:

y-1/x+y= 1/3

x-1/y+1=1

The solution is x=7;y=5

That is, there are 7 trees on the tree. There are 5 of them.

1. C

2. C

3. 120°

4. Solution: ∠AMG=∠3.

Reason: ∵∠1=∠2,

∴AB∥CD (the internal offset angles are equal and the two straight lines are parallel).

∵∠3=∠4,

∴CD∥EF (the internal offset angles are equal and the two straight lines are parallel).

∴AB∥EF (two straight lines parallel to the same straight line are parallel).

∴∠AMG=∠5 (the two straight lines are parallel and the angles are equal).

And ∠5=∠3, ??

∴∠AMG=∠3.

5. .(1) Suppose the Walkman is x yuan and the school bag is y yuan,

x+y=452 x=4y-8 Substitute 2 into 1 to get 4y-8 +y=452, the solution is y=92, x=360

(2) If you buy it at A, it will cost 452*0.8=361.6 (yuan)

If you buy it at B It costs 36 (92-90) = 362 (yuan)

So he can buy it at both supermarkets A and B, but A is cheaper

6. A4( 16,3)

B4(32,0)

An((-2)^n,(-1)^n*3)

Bn ((-2)^n*2,0)

1.A

2.C

3.A

4 .The meaning of Xiaohong: Two straight lines with equal angles are parallel

The reason of Xiaohua: Two straight lines with equal interior angles are parallel

Another set of parallel lines: AB//CE Reason: ∠ ABC=∠ECD →AB//CE (two straight lines with equal angles are parallel)

5. Assume 2 yuan x sheets, then 5 yuan 58-20-7-x sheets

2x+5 (58-20-7-x) +210*7=200 x=15

15 cards for 2 yuan, then 16 cards for 5 yuan

6. ( 1) SΔABC=SΔABP, SΔAPC=SΔBPC, SΔAOC=SΔBOP

(2) SΔABC=SΔABP, the areas of triangles with the same base and equal height are equal (3) Connect EC, and draw the parallel line of EC through point D, The parallel lines intersect CM at point F.

EF is a straight road that meets the requirements.

(3) Reason

Because the parallel line is parallel to EC, the distance from point D to EC and the height of triangle ECD on side EC = the distance from point F to EC and the height of triangle ECF is High on edge EC.

The area of ??triangle ECD = the area of ??triangle ECF.

So,

The area of ??pentagon ABCDE = the area of ??quadrilateral ABCE + the area of ??triangle ECD

= the area of ??quadrilateral ABCE + the area of ??triangle ECF.

Therefore, the straight path EF meets the requirement.

It makes sense, three more means 99, and one less refers to 3 (also refers to three talents), and they are all odd numbers. There are many distributions of this kind of question. But this kind has some meanings, and the others are just questions.