A joke in math, a joke in a math book.

Once, my mother patiently inspired her to do arithmetic: "Ya Ya, have you learned to do subtraction?" Come on, let's see, how much is 4 MINUS 2? "

"It's already two o'clock, Mom."

"That's right, good boy. So, what about 5 MINUS 5? "

"Five minus five, minus five ..." Yaya muttered, "I won't, Mom."

"Son, you can't! Think about it, for example, you have five coins in your pocket, but suddenly, all five coins fall out. Tell me, what else do you have in your pocket? "

Ya Ya blinked her eyes and said, "Did you drop it? Well, there is still a hole in my pocket! "

"I got 100 in arithmetic."

"That's because you learn well."

"But I never listen in class."

"That's because you are smart. You will know to study hard when you come home from school."

"Smart? A little, but after school, I am a person who deals with football. "

"Then you must have cheated in the exam."

"I can't say that. I didn't copy books or peek at others. How can I be derailed? "

"Then what happened to you?"

"I kicked Jim, the bookworm in front, in the chair."

"If you don't, you won't. How can you be so naughty? "

"I kicked the first foot, and he stretched five fingers back with his hand."

"What does this mean?"

"The answer to the first question is 2+3."

"Oh ... what if I ask the 5×8 answer to the tenth question?"

"It was after I kicked the tenth foot that he stretched out four fingers first and then clenched his fist immediately, so I knew the answer of 40."

The teacher announced the results: "Xiaohua 30 points, Xiaoming 20 points ..."

Piglet: I got 0!

Dog: What should I do? me too ...

Piglet: We both got the same score in the exam. Will the teacher think we cheated?

Mathematical jokes

1, there is something wrong with the probability.

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

"oh? Tell me your reasons. "

"There are 50 students in our class. According to the calculation, the probability of being asked is 2%, but today you almost let me.

I answered all the questions. "

2. Possibility

I visited the weather station and saw many latest weather forecasting instruments. After the visit, I asked the stationmaster, "You said there were hundreds."

How is the 75th probability calculated when it rains? "

Without much thought, the stationmaster replied, "That is to say, there are four people here, and three of them think it will rain."

3. Death toll

Jenison, an English poet, wrote a poem, several lines of which read: "Every minute, a person is dying, and everyone.

Every minute, a person is born ... "After reading it, a mathematician wrote to question it. The letter said, "Dear Sir, stop reading. "

This is a quick job, but a few lines are illogical and it is difficult to agree. According to your algorithm, the number of casualties per minute is balanced and accurate.

The number of people on the ball is eternal. But you know, in fact, the population on the earth is growing. properly speaking

There are 1.6749 people born every minute, which is quite different from the number you provided in the poem. To be realistic,

If you don't object, I suggest you use a score of 7/6, that is, change the poem to: "One person dies every minute,

Every minute, 1. 6 people are born ... "

4. Empirical equation

The physics professor walked across the campus and met the math professor. The physics professor is doing an experiment and he has summed up an empirical formula.

Cheng seems to agree with this experimental data. He asked the math professor to look at the equation. They met a week later, the math professor said

This equation doesn't hold water. But at that time, the physics professor had predicted further experimental results with his equation, and the effect was quite good.

Good, so he asked the math professor to review the equation again. Another week later, they met again. The math professor told me

Professor v. physics said that this equation does hold, "but it only applies to the simple case of positive real numbers."

5, nailing

Engineers, physicists and mathematicians received a task at the same time: nailing the wall. Engineers built

Universal nailing machine is a machine that can nail any possible nail into any possible wall. physicist

A series of tests were made on the strength of hammers, nails and walls, and then a revolutionary technology-ultra-low temperature was developed.

Ultrasonic nailing technology. Mathematicians extend the problem to N-dimensional space, and think that a 1 dimensional nail with kink penetrates a.

The problem of N- 1 dimensional super wall. Many basic theorems have been proved. Of course, abstinence of this topic gives a simple answer.

The existence of is far from obvious.

6. Maximum area

A farmer invited engineers, physicists and mathematicians to enclose the largest area with the least fences. engineering

The teacher drew a circle and declared that it was the best design. Physicists pull the fence into a long straight line, assuming that

The fence is infinitely long, so I think it is big enough to enclose half the world. The mathematician gave them a big laugh. He seldom uses fences.

Barbara surrounded herself and said, "I'm outside now."

7. Mathematicians' answers

Physicists and engineers got lost in a hot air balloon in the Grand Canyon. They shouted for help: "Hello!

Where are we? "About 15 minutes later, they heard a response echoing in the valley:" Hey! You are in a hot air balloon.

Yes! The physicist said, "That guy must be a mathematician." The engineer wants to know, "Why?" physicist

Tao: "Because it took him a long time to give a completely correct answer, and this answer is useless."

8. The solution exists.

Engineers, chemists and mathematicians live in three adjacent rooms of an old inn. The engineer's coffee started that night.

When the machine caught fire, he woke up smelling the smoke, unplugged the coffee machine, threw it out of the window, and then went to sleep. soon

The chemist also smelled smoke when he woke up. He found that cigarette butts lit the trash can. He said to himself, "How to put out the fire?

We should lower the fuel temperature below the ignition point and isolate the combustion products from oxygen. Watering can do both. "So.

He dragged the trash can into the bathroom, turned on the tap, put out the fire and went back to sleep. Mathematicians saw all this outside the window.

So, after a while, he didn't worry at all when he found his ashes burning the sheets. Say, "hey, the solution is.

Yes! "Then go to sleep.

9. Negative numbers

Mathematicians, biologists and physicists sat in street cafes and watched people walk into a house across the street.

Get out. They first saw two people go in, and after a long time, they saw three people come out. Physicist: "Do you measure?"

Accurate enough. Biologist: "They reproduce." Mathematician: "If one more person goes in now, then the house."

It will be empty. "

10, fire protection

One day, the mathematician felt that he had had enough of mathematics and ran to the fire brigade to announce that he wanted to be a fireman. fire fighting

The captain said, "You look good, but I have to give you a test first." After the fire chief brought the mathematician to the fire brigade,

There is a warehouse, a fire hydrant and a hose in the courtyard alley. The fire chief asked, "suppose the warehouse is on fire, you

What shall we do? The mathematician replied, "I connected the fire hydrant to the water pipe, turned on the water pipe and put out the fire." firemaster

Said, "Exactly! Last question: suppose you walk into an alley and the warehouse is not on fire, what would you do? " mathematics

The economist pondered for a long time and finally replied, "I will set fire to the warehouse." The fire chief shouted, "What?

That's terrible! Why did you set fire to the warehouse? The mathematician replied, "In this way, I will simplify the problem into a problem I have."

A problem that has been solved. "