Interesting brain teasers, interesting math problems
Among the ten birds, Xiao Ming shot and killed one, but the other nine didn't fly away. Why?
Answer: That's a flock of ostriches.
Dai Xiao went to the kitchen with a match in his hand. There is a gas stove and an alcohol lamp. What should he order first if he wants to boil water?
Answer: matches
Where is asking for trouble?
Answer: pharmacy
How to write zero in Roman numerals?
Answer: Roman numerals have no zero.
What is the most valuable thing lost?
A: Satellite.
There was Yuan and a meat bone on the ground, but Amin picked it up. Why?
Answer: Because Amin is a dog.
There is a kind of chess with only two kinds of pieces. Do you know what this is?
Answer: Go, only black and not white.
What fills a room and people can move freely?
Answer: air and light.
There is one thing that both buyers and sellers know, but only users don't know. What is this?
Answer: coffin
Xiaoming's mother has three sons. The eldest son is called heavy hair, the second son is called two hairs, and what is the third son's name?
Answer: Xiao Ming
Who is always afraid of taking a bath?
Answer: clay figurine
What eggs can't be broken, boiled or eaten?
Answer: I got a zero in the exam.
What must everyone do seriously every day?
Answer: Sleep.
A Dai fell from the hot air balloon, but he was not hurt. Why?
Answer: Because the hot ball is on the ground.
Xiao Li's English is very good, but foreigners can't understand it. Why?
Answer: Foreigners are Japanese.
How many sides does the box have?
A: Two sides, inside and outside.
Which tooth was pulled out at last?
Answer: Dentures.
Xiao Zhang never touches the ground when he walks. Why?
Answer: Because of wearing shoes.
Why do hens have short legs?
Answer: so that the eggs won't break.
In ancient times, who became a father-in-law first and then a father?
Answer: eunuch
Interesting brain teasers, interesting math problems
1. Suppose 1=5 2=6 3=8 4=7 5=?
Answer: 1
2. A tailor has a piece of woolen cloth, which is16m long. She cuts 2 meters from it every day and asks how many days later, she cuts the last piece of woolen cloth.
Answer: (8- 1)=7 (days)
3.a b c + c d c = a b c d
How much is abcd?
Answer: a= 1 c=9 d=8 b=0.
109+989= 1098
4. Ali said that under certain conditions, 4- 1=5, and said that Xiaoying can prove the correctness of this method by graphic means. 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.
5. The price of each bottle of soda is 1.00 CNY, and every two empty bottles can be directly exchanged for 1 bottle of soda. If you buy soda with 20.00 CNY, how many bottles can you drink?
Answer: 1. Buy 20 bottles, drink 20 bottles, and empty 10 bottles (20).
2.20 Empty bottles are 10 bottles, drinking 10 bottles and empty 10 bottles (10).
3. 10 5 bottles for empty bottles, 5 bottles for drinking, 5 bottles for empty bottles (5)
4.5 Empty bottles for 2 bottles, drink 2 bottles and empty 3 bottles (2)
5.3 Empty bottles are 1 bottle, drink 1 bottle and empty 2 bottles (1).
6.2 Empty bottles are 1 bottle, 1 bottle, and empty bottles are 1 bottle (1).
7. Borrow 1 empty bottle, * * 2 empty bottle, exchange 1 bottle for drinking, and exchange the empty bottle for someone else (1).
Total: 20+10+5+2+1+1= 40 bottles.
6. 1-70 1=2 spelled with matchsticks. Move a matchstick to make the equation hold.
Answer: 1 plus the minus sign on 1 = 2...7.
7. 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.
8. An officer made 24 soldiers stand in six rows, each with five people. Soldiers are all stupid. The last soldier finally came up with a good idea. How did he arrange it?
Answer: Just arrange in a hexagon.
9. How many eggs are there in a dozen?
Answer: 0, because it is broken.
10. A person bought a chicken for 8 yuan, sold it for 9 yuan, and then thought it was not worthwhile. He bought it with 10 yuan, and bought another one with 1 1 yuan. How much did he earn?
This is an interview question:
There are three algorithms:
1. At first, there was only 8 yuan, and finally you had 1 1 yuan, so you earned 3 yuan;
2. The first time the protagonist lost 8 pieces, and the second time he got a chicken; The hero gets 9 pieces and loses a chicken; On the third sale, the hero lost 10 and got a chicken. In the fourth transaction, the hero got 1 1, and one chicken was missing, so the total GDP was 8+9+10+1= 38 yuan +4 chickens.
There are three transactions in the whole event. Let's see which three deals are specific.
The first transaction: 8 yuan buys, 9 yuan sells, and gains 1 yuan;
The second transaction: 9 yuan sells, 10 yuan buys, and the profit is-1 yuan;
The third transaction: 10 yuan buys, 1 1 yuan sells for profit 1 yuan;
The whole process:1-1+1=1yuan.
So the analysis shows that this person is a fool, because the last two transactions are equal to nothing.
Some interesting math brain teasers
1. There is no water in the pool and no soil on the ground (type a word)? -A: Yes.
Please fill in a number in the brackets to make the following formula hold: 98765432()= 88888888- Answer: 9.
3.50 candy for 10 children. The numbers are different. You can't break the sugar. Can you share it? Answer: No, because "1+2+3...+ 10" = 55.
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.
Dad promised Hansen that he would be rewarded 10 yuan if he passed the exam, but why did Hansen still fail? Answer: To save money for my father.
6. Xiaohong had 10 copper coins in his pocket, but they all fell out. What's left in Xiaohong's pocket? Answer: There is another hole.
7. When is four minus one equal to five? Answer: quadrilateral, MINUS one angle, becomes pentagon.
8. Three people wanted to cross the road, and there was no traffic at that time. Only two people walked to one side of the sidewalk. Where's the other guy? Answer: On the other side of the road.
9. The teacher put five apples in the basket and prepared to give them to five children. Every child will get one, but there is still one in the basket. How to divide it? Answer: Five people will be divided into one and four times.
10. It is said that there were ten suns on the ancient earth. Why is there only one left now? A: Because the nine suns were used by Chyi Chin to write songs.
1 1. A Yan has * * 10 coins in his pocket, and he missed 10 coins. What else is in his pocket? Answer: A hole.
12. Mathematical Brainstorming and Answers
What is 13. 123? Answer: It is a number.
14. Bangkok is in the rainy season. One day at midnight 12, there was a heavy rain. Q: Will the local sun shine in 72 hours? Answer: The sun will not appear at midnight 12 after 72 hours.
15. Heavy smoker A smokes 50 cigarettes a day, while heavy smoker B smokes 10 cigarettes a day. Five years later, smoker B smoked more cigarettes than smoker A. Why? A: Heavy smoker A smoked too much and died young.
16. One night, there was a strong wind. At this time, there are always 12 lighted candles on a table. First three were blown out by the wind, and then two were blown out by the wind. Finally, how many candles are left on the table? Answer: 5. Everything else is burnt out.
17. Three apples eat one, why are there three left? Answer: two are outside the stomach and one is inside.
18. 100 football knockout, how many games must be played to decide the champion team? Answer: Only one team can be eliminated at a time, so it takes 99 times.
19. Is there anything in the world that carries people at a speed close to 2000 km/h without refueling or other fuels? -answer: the earth
20. A person goes to an Internet cafe and meets a classmate with two friends. Each classmate has four children and each classmate has two friends. How many people go to the Internet cafe? Answer: one person, others didn't say go.
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