What are some short stories about fractional multiplication and division and mathematicians? [It must be short, because it is written on the handwritten newspaper! 】 urgent! ! ! ! ! ! ! ! !

Once, Mr. Wang asked an interesting question in class: "I don't know how many things there are today." 3322, 5522, 7722. What is the geometry of things? " After a long time, none of the students could answer. When Mr. Wang scanned the class with his eyes, most of the students bowed their heads, fearing that the teacher would shout for an answer.

Only one student is nervously calculating with the pen on the desk. After a while, the students raised their hands to ask for an answer. He said loudly, "Twenty-three." Teacher Wang asked, "Do you think his answer is right?"

Silence returned to the classroom, and the students just looked at the student who stood up in surprise. He is a very modest Chinese. Teacher Wang said, "He got it right." Then the teacher told everyone that this is a famous topic in Sun Tzu's Art of War in ancient China.

2. Gaussian addition

One day, because his math teacher had dealt with more than half of the things, he still wanted to finish class, so he planned to give the students a math topic to practice. His topic is:1+2+3+4+5+6+7+8+9+10 =? .

Because addition has just been taught for a short time, the teacher thinks it will take students a long time to work out this problem, so that they can use this time to deal with unfinished things. But in the blink of an eye, Gauss had stopped writing and sat there doing nothing.

The teacher asked Gauss how to calculate. Gaussian replied, I just found that the sum of 1 and 10 is1,the sum of 2 and 9 is also 1 1, and the sum of 3 and 8 is also 1 1. 11+11+1+11= 55, that's how I calculated it.

3. Throwing experiment

One day, French mathematician Buffon invited many friends to his home and did an experiment. Buffon spread a big piece of white paper on the table, which was covered with parallel lines with equal distance. He also took out many small needles of equal length, the length of which was half that of parallel lines.

Buffon said, "Please leave these small needles on this piece of white paper!" " The guests did as he said. Buffon's statistics show that everyone throws 22 12 times, in which the small needle intersects the parallel line on the paper 704 times, and 2210 ≈ 704 ≈ 3.142.

Buffon said, "This number is an approximation of π. Every time you get an approximation of pi, the more times you throw it, the more accurate the approximation of pi is. "

Step 4 dry bullets

One day, the math teacher gave the class a question like this: "Four good friends met to go hunting in the forest. Along the way, they were all in high spirits, talking and laughing, but it happened that the weather was not good, and it suddenly rained halfway, and all four of them were soaked. "

But the rain stopped, and the four men's interest in hunting continued unabated. So they checked the ammunition and guns and found that some bullets were no longer usable, so the four men divided the remaining usable dry bullets equally.

When hunting, four people each shot six bullets. When it was dark, the four men went home with their prey. On the way, the four people counted the bullets and found that the number of bullets left by everyone at this time happened to be the number of bullets earned by one person when sharing the bullets equally. Now, how many dry bullets? ""Teacher, the grade is 32. " China immediately stood up and replied.

5. It takes seconds to solve difficult problems

A teacher wants to tell his three students which is smarter. He used the following methods: show them three white hats and two black hats in advance, then tell them to close their eyes, put on their hats respectively and hide the remaining two hats. Finally, tell them to open their eyes, look at other people's hats and say the color of their hats.

The three students looked at each other, hesitated for a moment, and said in unison that they were wearing white hats. Think about it. How do they know the color of the hat? "In order to solve the above problems, let's first consider the problem of' two people 1 black hat and two white hats'.

Because the black hat is only 1, and I wear it, the other party will immediately say that he is wearing a white hat. But he hesitated for a moment, which showed that I was wearing a white hat. In this way, the problem of "three people, two blacks and three whites" will be solved.

Suppose I wear a black hat, then the two of them become a question of "1 two people with black hats and two white hats", and they can answer it right away, but they all hesitated for a while, which shows that I wear a white hat and the three of them have the same thinking, so they all took out their own white hats.