Encyclopedia of mathematical brain teasers 1
1, Ali said that under certain conditions, 4- 1=5, and said that Xiaoying could prove the correctness of this method graphically. After Ali produced the evidence, she had nothing to say. How did Ali prove the test? Guess.
Answer: A table with four corners has five corners after cutting off one corner with a knife.
Can you make a number greater than 3 and less than 4 with three chopsticks?
Answer: Take pi "∏"
It takes 4 hours from Beijing to Nanjing, and the train goes from Beijing to Nanjing. Two hours later, where is the train now?
Answer: On the tracks.
The height under the bridge can only be limited to ten meters, but the cargo on board has exceeded ten meters. What should I do?
Answer: If you put some big stones on the boat, it will sink a little.
5. The number without the first number is 13, and the number without the last number is 40. What's the number, please
Answer: Forty-three
6. When is 5 greater than 0, 0 greater than 2, and 2 greater than 5?
Answer: 5 is cloth, 0 is stone and 2 is scissors.
7. Eight numbers "8", how to make it equal to 1000?
Answer: 8+8+8+88+888
8. How to divide five apples between two people is the fairest?
Answer: squeeze into juice
9. A tiger was tied to a tree with a rope length of 10 meter. There is a pile of grass 0/00 meters away from the tree/kloc-.How can it eat that pile of grass?
Answer: Tigers don't eat grass at all.
10. The Yi people in A Niu eat three hectares of pasture every year. The pasture covers an area of 30 hectares and has 5 cows. How long will it take to eat them all?
A: The spring breeze blows high and you can't eat for a lifetime.
1 1. In the Persian Gulf War, why did American troops suffer fewer casualties at night than Iraqi troops?
Answer: There are many black people in America.
Fat girls weighing 12 and 100 Jin heard that cycling can lose weight, so they tried it. Guess what the result is?
Answer: The horse lost ten kilograms.
13. Monkeys can break a corn every minute. How many corns can a monkey break in an orchard in five minutes?
Answer: I didn't get one.
14. There are six oranges in the plastic bag. How to divide the three children, and there are two oranges in the plastic bag? (Don't separate oranges)
Answer: Of course, one person has two oranges, but one is given to him in a plastic bag.
15. Boss Li keeps some red goldfish and some black goldfish. He found that the red goldfish ate twice as much fish food as the black goldfish. What is the reason?
Answer: Because there are twice as many red goldfish as black goldfish.
There is an apple and a monkey on the apple tree. How many apples and monkeys are there in the tree?
Answer: An apple has no monkeys, because I went to war.
17. How many minutes does it take to cook one egg and eight eggs?
Answer: Four minutes.
18, Chuchu's birthday is March 30th. What year is this year?
Answer: March 30th every year.
19, an officer made 24 soldiers stand in 6 rows, with 5 people in each row, and the soldiers were all stupid. The last soldier finally came up with a good idea. How did he arrange it?
Answer: Just arrange in a hexagon.
Math brain teaser II
1. has seven rings, which are interlocked into a straight line. Seven rings can only destroy one of them. You can only take one ring at a time. You can't take more or less at a time. Ask you to take the seventh ring and the seventh ring respectively? -Answer: Eliminate the third one.
Nick got more than 500 points and Jacques got more than 600 points. Why do teachers think their grades are equal? Answer: Nick took six exams and Jacques took seven.
3.9999 Nothing (to use an idiom)-Answer: foolproof.
4. A laundry sign says "24-hour laundry". Gao Xiao had it washed today. Why did the boss say it would take three days to get it? Answer: Because working eight hours a day, three days is exactly 24 hours.
5. Xiaohong has 10 copper coins in his pocket, but they are all dropped. What's left in Xiaohong's pocket? Answer: There is another hole.
6. It takes 30 seconds for the wall clock to strike six times, and how many seconds does it take to strike 12? Answer: 66 seconds
7. 1+ 1 is not 2. What is Wang, 1 1? -A: Feng
8. At a banquet, a couple shook hands with the guests 48 times and asked how many people were at the banquet. Answer: 26 people
9. Under what circumstances does one plus one definitely not equal to two? Answer: a kilo of flour and a large glass of water will only be equal to a piece of dough.
10. This Roman number stands for 9. How to add a sum to make it even? Answer: Add "S" because six means six.
1 1.8 How long does it take for one person to eat eight servings of fast food 10 minutes, 16 people to eat 16 servings of fast food? Answer: 10 minutes.
12. Three apples eat one, why are there three left? Answer: two are outside the stomach and one is inside.
13. Kindergarten is over, but no children go out the gate. What happened? A: The gate is under repair. Please take the test door.
14. Which month has 28 days? A: There are 28 days in a month.
15. There is a family of four brothers. The age of the four of them is 14. How old are they? Answer: 1, 1, 2, 7. There are twins among them.
16. There is a ladder hanging on the side of the boat, 2 meters away from the sea. The sea water rises by half a meter per hour. How many hours can seawater submerge the ladder? Answer: A rising tide lifts all boats, but water will not drown the ladder.
Math brain teaser 3
1. A person bought a chicken for 8 yuan and sold it for 9 yuan. Then he thought it was not worthwhile, 10 yuan bought it back and sold it to another person for 1 1 yuan. Ask him how much money he earned.
Answer: 2 yuan.
2. Suppose there is a pond with unlimited water. There are two empty kettles with a capacity of 5 liters and 6 liters respectively. The problem is how to get 3 liters of water from the pond with only these two kettles.
Answer: Fill it with a 5-liter pot and pour it into a 6-liter pot.
Pour the 5-liter pot into the 6-liter pot until the 6-liter pot is full. At this point, there are 4 liters of water left in the 5 liter pot.
Pour all the water out of the 6-liter pot, and pour the remaining 4 liters of water from the 5-liter pot into the 6-liter pot. At this time, there are only 4 liters of water in the 6-liter pot.
Fill the 5-liter pot again and pour into the 6-liter pot until the 6-liter pot is full. At this time, there are only 3 liters of water left in the 5-liter pot.
3. A farmer took three rabbits to the market to sell. Each rabbit weighs about three or four kilograms, but the farmer's scale can only weigh more than five kilograms. He asked him what he called it.
Answer: weigh three first, then write down one, and calculate the difference after weighing.
A monkey picked 100 bananas in the forest and piled them up. The monkey's home is 50 meters away from the banana pile, and the monkey intends to carry the bananas home.
You can take up to 50 sticks at a time, but monkeys are greedy. He eats a banana every meter. Ask the monkey how many sticks he can take home at most.
Answer: 25.
First recite 50 to 25 meters. At this time, I ate 25, ate another 25 and put it down. Then I'll recite the remaining 50 later. When I grew to 25 meters, I ate 25 and another 25. Then I picked up 25 roots on the ground, one ***50, and continued to walk home. 25 meters, I have to eat 25.
There are 65,438+02 lighted candles on the table. First three were blown out by the wind, and then two were blown out by a gust of wind. Finally, there are five candles left on the table.
6. Brother * * * has 45 yuan. If the eldest brother increases 2 yuan's money, the second brother decreases 2 yuan's money, the third brother doubles it and the fourth brother reduces it to 1/2. At this time, four people have the same amount of money. How much money do they have? Eldest brother 8, second brother 12, third brother 5, fourth brother 20 32. How many heads does a rope with three and a half ends have? 8 heads, (half a rope is also two heads)
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