Interesting math problems and the math in them

said that a person went to the market, bought a chicken for 8 yuan, and sold it for 9 yuan. He thought it was cheap, so he bought it back for 10 yuan and sold it again for 11 yuan. Q: Did he lose or earn, and if he did, how much did he lose, and how much did he earn?

Answer: Earned, it's 2 yuan.

This question seems simple, but if you think about it carefully, it is still confusing.

This question is still very interesting.

Let's say a TV show:

I'll use the playing cards. It has to do with the overview.

I have ten cards in my hand, and one of them is an ace of hearts.

If you guess right, there is a big prize.

You couldn't see the cards, so I picked one, and I laughed and asked if you wanted to change it.

You insist, so I laughed and made you look at one of the other nine cards (not a red ace, of course), and you should change it or not. If you don't change it, I'll let you watch the next one, can you change it? If you keep going like this, will you change it?

If you still don't make it, I'll keep showing you that I have two cards left. Do you want to change it?

Note: I have no grudge against you, I don't care who gets the bonus, I just want to make the show more exciting.

There were ten birds in the tree, and a hunter killed one with a gun, how many birds are there in the tree now???

This is an interesting and controversial question.

There are many possible answers, please refer to:

1.Not a single one was gone, because they were all scared away.

2.There are nine more, because the rest are deaf.

3.There were ten more, for the one that had been slain was still hanging from the tree.

Hehe......Hope it can meet the requirements you want!

It takes a total of 1 hour to burn an uneven rope from beginning to end. Now there are several pieces of rope of the same material, and I ask how to burn the rope to time an hour and fifteen minutes? (Note: The rope is uneven).

Principle: Learn to think symmetrically (the rope can be burned from both ends at the same time).

In ancient China, there were many such problems, such as: the problem of chickens and rabbits in the same cage.

Why is the axis of symmetry of an axisymmetric figure a straight line?

Interesting math problems in life are as follows:1. Egg problem: Xiao Zhang sells eggs, a basket of eggs, the first person comes to buy half of it, and then gives him another one.

The second person bought half of it, and Xiao Zhang gave him another egg. The third person bought half of the eggs, and Xiao Zhang gave him another one. The fourth person came to buy half of it, Xiao Zhang gave him another one, and the eggs were just finished!

How many eggs does Xiao Zhang have in total?

2. Table problem, a square table, cut off a corner and how many corners?

3. Tofu cutting problem: How many pieces can you cut into three pieces of tofu with three knives?

4. Cutting watermelon problem: cut 7 cloves with three knives, and there are 8 pieces of skin left after eating, how to cut it?

5. Bamboo pole question: Can a 5-meter-long bamboo pole pass through a one-meter-high door?

A chicken that lays 5 eggs in 5 days. How many chickens do you need for 100 eggs in 100 days?

How many buckets of water do individuals use for 3 days and 9 people use for 9 days?

3.How long does it take for three children to eat three loaves of bread, and ninety for ninety children?

4.How do I use the simplest way to make the x+i=ix equation true?

5.It costs 214 yuan to buy a pair of high-end women's leather shoes and 5 jiao and 6 cents, how much does it cost to buy one?

6.There are three children guessing boxing, one out of scissors, one out of rock, one out of cloth, how many fingers do the three people have?

7.What would be the thing that wastes one-third of a person's life?

8.Can an 11 cm ruler be used to measure the length of any whole centimeter between 1 and 11 cm with only 3 integer scales? If so, which scales should be engraved?

9.In the exam, Xiaohua rolls the dice to determine the answer, but there are 20 questions, why did he throw it 40 times?

10.It takes 30 seconds for a wall clock to ring six times, and how many seconds does it take to strike 12 times?

11.When is 4-3=5?

12.Aunt Wang has three sons, and each of these three sons has an older sister and younger sister, how many children does Aunt Wang have?

13.There are six oranges in a plastic bag, how do you divide them equally among three children, and there are still two oranges in the plastic bag? (You can't separate the oranges).

The number "8", how do you make it equal to 1000?

15.When does four minus one equal five?

The math problems in life are as follows:1. The problem of baking cakes: it takes two minutes for the mother to bake a cake, one minute for each of the front and back sides, and a maximum of two cakes in the pot at the same time, so how many minutes does it take to bake three cakes at least?

2. Socks problem, there are 5 pairs of socks of different colors in the drawer, and the light is not turned on, so how many socks of the same color need to be taken out?

3. Table problem, a square table, cut off a corner and how many corners? Orange Brigade.

4. Cut tofu and ask the question: How many pieces can a piece of tofu be cut into three knives?

5. Cutting watermelon problem: cut 7 cloves with three knives, and there are 8 pieces of skin left after eating, how to cut them?

6. Bamboo pole question: Can a 5-meter-long bamboo pole pass through a one-meter-high door?

7. Carton problem: Can a square box with a side length of one meter put down a wooden stick of rice?

8. Clock question: 12 hours, how many times do the clock and minute hand repeat?

It's still quite a lot.

1. The problem of baking cakes: it takes two minutes for the mother to bake a cake, one minute for each of the front and back sides, and a maximum of two cakes in the pot at the same time, so how many minutes does it take to bake three cakes at least?

2.Socks problem, there are 5 pairs of socks of different colors in the drawer, the light is not turned on, to take out a pair of socks of the same color, how many of them need to be found at most?

3.Egg problem: Xiao Zhang sells eggs, a basket of eggs, the first person comes to buy half of it, and Xiao Zhang gives him another one.

The second person bought half of it, and Xiao Zhang gave him another egg. The third person bought half of the eggs, and Xiao Zhang gave him another one. The fourth person came to buy half of it, Xiao Zhang gave him another one, and the eggs were just finished!

How many eggs does Xiao Zhang have in total?

4 table questions, a square table, cut off a corner and how many corners?

5.Tofu cutting problem: A piece of tofu can be cut into three knives, and a maximum of how many pieces can be cut into 6 watermelon Question: Three knives cut 7 petals, and there are 8 pieces of skin left after eating, how to cut it?

7.Bamboo pole question: Can a 5-meter-long bamboo pole pass through a one-meter-high door?

8. Carton problem: Can a square box with a side length of one meter put down a wooden stick of rice?

9.Clock Question: 12 Hours, How Many Times Does the Clock and Minute Hand Repeat?

10.Origami Question: How thick is a piece of paper with a thickness of 1 mm, folded in half 1000 times? ......

If the waiter also refunds the 2 yuan, the three people do not have to spend 9 yuan each but the actual 25 3 yuan, so the 2 yuan is privately swallowed in the total of 27 yuan of 9 yuan per person, so it cannot be counted as 3 * 9 + 2 = 29, it should be counted as 2 + 3 + 25 3 * 3 = 30 yuan. There is no such thing as 1 yuan to go to **.

27 is the money spent by the customer, how can 2 dollars be added up in these 27? It's 27 equal to the boss's 25 + 2 pieces taken by the waiter, and this number plus the 3 pieces returned is 30, ok

The first problem can be solved by using a similar triangle, first using a wooden stick in a sunny weather, first measuring the length of the wooden stick, then placing the wooden stick perpendicular to the ground (except for measuring the Leaning Tower of Pisa), measuring its shadow length, and then measuring the shadow length of the building, using the proportional formula of similar triangles.

Half a catty of green onion white and half a catty of green onion is one catty of one yuan, but if you buy it separately, it is 7 cents a catty + 3 cents a catty = one yuan and two catties, 100 2 = 50 (yuan) 50 yuan and two catties, 2x50 = 100 (catties), so he lost 50 yuan.

The actual amount of money paid by the three is: 9x3=27 yuan.

The money that the waiter embezzled was: 2 yuan.

The actual amount of money received by the hotel is: 25 yuan.

Then: 25 + 2 = 27 yuan.

(2) The man who sells green onions says:"Sell, green onion white 7 cents, green onion 3 cents. "It is equivalent to: a pound of green onions is 7 cents, and a pound of green onions is 3 cents, so two catties of green onions are only 1 piece, so 100 divided by 2 is 50 yuan.

Because it is necessary to distinguish 27 yuan and 2 yuan here, 27-2 = 25 should be used instead of 27 yuan, and 2 yuan is not included.

1.In fact, it is a misleading calculation method, in the waiter returned 1 yuan, that is, 10-1 = 9, each person only spent 9 yuan, 3 people 9 yuan each, 3 x 9 = 27 yuan These money has included the waiter secretly hid 2 yuan in addition to the 3 yuan in their hands, just 30 yuan, in fact, there is no less.

2.Because when the green onion is bought together, whether it is green onion white or green onion is 1 yuan and 1 catty sold separately, it becomes green onion white 7 mao, which is 3 cents lower than the original, and green onion is 3 mao, which is 7 cents lower than the original, so the person who sells green onions loses 3x50 + 7x50 = 50 yuan, so selling things sometimes requires knowledge.

It's a misleading question, and you can't follow his train of thought, backwards.

Haven't the answers to these 2 questions been published on the Internet for a long time?

Chickens and rabbits in the same cage.

The question of maximum profit.

Xiaoya and her mother went to the supermarket to buy a toothbrush and a box of chocolates. Toothbrush: 12 yuan, chocolate: 58 yuan. Q: How much did they spend in total?

One line, a total of 20 words can be written, I wrote 60 words, how many lines do I need?