Interesting facts in mathematics

1. Plus sign

There is a family whose child has never been good at math. His parents changed him to many schools. Finally, the parents and their child changed churches. In elementary school, this child was among the best in mathematics. The parents were also surprised and asked: "Is the teacher teaching good?" The child said: "No." The parents asked again: "Are the teaching materials different?" The child said: "No." The parents asked: "What is that?" "The child said: "As soon as I entered the classroom, I knew that mathematics was taken seriously here, because as soon as I entered the door, I saw someone with a plus sign!"

2. Mathematics in Chinese

An American graduate student in the Department of Mathematics came to Taiwan to collect information on the development of mathematics in ancient China. My friend asked me to entertain him on his behalf. It was his first time in the East and he had never learned Chinese, but he learned to write the intricate character "Zhang" in just half an hour - and it was in cursive script. Surprised, I couldn't help but ask this genius for advice. He said: "It's nothing. I just wrote the number three and thirteen-quarters with one stroke."

　 3. Unable to guide everywhere

There was a foreigner A scholar (who is engaged in mathematics research) visited our school and stayed in the school’s guest house for foreign guests. When he was leaving, I asked him what his impression of our school was. He said: “The guest house in your school is too bad. I won’t visit it again in the future.” I don’t dare to live anymore!” I hurriedly asked the reason. The professor said: "That eating bowl, the mouth of the bowl is not divisible, how can it be used by people!" I listened and laughed, the professor's metaphor was really vivid! Although it is a joke, it can deepen our understanding of the concepts of continuity and differentiability.

4. Negative numbers

Mathematicians, biologists and physicists are sitting in street cafes , watching people walk in and out of a house across the street. First they saw two people go in, and as time passed, they saw three more people come out. Physicist: "The measurements are not accurate enough." Biologist: "They reproduced." Mathematician: "If one more person comes in now, the house will be empty."

5. Mathematician The answer

Physicists and engineers got lost in the Grand Canyon in a hot air balloon. They shouted for help: "Hey -! Where are we?" After about 15 minutes, they heard the response echoing in the valley: "Hey -! You are in a hot air balloon!" The physicist said: "That guy He must be a mathematician. "The engineer asked puzzledly: "Why?" The physicist said: "Because he spent a long time to give a completely correct answer, but the answer was of no use at all."

6. My father’s drinking capacity

Mathematics teacher: “There are three glasses of wine on the table. I’ll treat your father to a drink. How many more glasses are there?”

Elementary school student: “Not even one glass. "

Mathematics teacher: "What? Didn't you understand me? I'll say it again, there are three glasses of wine on the table. How many more glasses are there for your father?"

Primary school student: “There really is no more glass.”

Mathematics teacher: “Do you understand mathematics?”

Primary school student: “Sir, you don’t understand my father’s He has a bad temper and refuses to let go of a glass of wine when he sees it."

7. Results

Teacher: "Let's learn subtraction today. For example, your brother has. 5 apples, what will happen if you take 3 from there? ”

Tom: “Well, he will definitely beat me up!”

8. Solve the problem.

In math class. The teacher said: "A palace is located at the highest point of the mountain. There are 5 platforms on the road leading to the palace. There are 20 steps between the platforms. How many steps do the children need to climb to reach the palace?"

"Go on board them all!" Little Carroll quickly replied.

9. Rounding

Zaizai came back from school happily and asked her mother: "Where is daddy?"

Mom saw Zaizai's excitement and felt strangely Ask: "Dad is at home, what do you want to do with dad?"

"I want 50 cents from dad."

"Why?" Mom asked.

"Before I took the math test, my father said to me, 'If I get 100 points, give me 1 yuan, and if I get 80 points, I'll get 8 jiao.' Today, I got 45 points in the math test." Zaizai replied.

Mom asked in surprise: "What! You only got 45 points on the math test?"

Zaizai said proudly: "Yes, math has to be rounded, so dad has to pay 50 cents Money. ”

10. Distributive Law of Multiplication

The teacher found a student’s name in the homework book: Mu (1 2 3).

The teacher asked: "Whose homework book is this?"

A student stood up: "It's mine!"

Teacher: "What's your name?" Name? "

Student: "Mu Linsen! "

Teacher: "Then why did you write the name like this? The distributive law of multiplication! " 11. At 11:30

In the fourth class in the morning, Student A was hungry and had no intention of listening to the class. He sat in his seat and thought about beef. bread.

The math teacher noticed that he was distracted and asked him: "What will happen if the decimal point of 1.130 moves one place to the right?"

Student A answered without hesitation: "It will Let’s have lunch! ”

12. Probability

I went to visit the weather station and saw many of the latest instruments for predicting the weather.

After the visit, I asked the webmaster: "When you said there was a 75% probability of rain, how did you calculate it?"

The webmaster didn't have to think too much. He replied: "That is to say, there are four of us here, and three of them think it will rain."

　13. Go study

A student threw a coin into the air: "If it's heads, I'll watch TV. If it's tails, I'll play games. If the coin stands up, I'll study."

14. How many times

Teacher in class Question: "How many wars did Spain have in the fifteenth century?"

"Six." One student quickly answered. ?"

"Which six times?" the teacher asked again.

"The first, second, third, fourth, fifth and sixth times."

15. There is a problem with probability

"Teacher, I found something wrong with the probability formula!"

"Oh? Tell me your reasons."

"There are 50 students in our class***. According to calculations , the probability of me being asked a question is 2, but in today’s class you almost asked me to answer all the questions.”