The application of pure mathematics refers to a single quantitative relationship, which constitutes a topic and does not involve the existence and relationship of quantities with real practical significance. Practical application is also a life topic about mathematics. The following is an interesting question and answer about junior high school mathematics that I compiled. I hope everyone will read it carefully!
First, the problem of counterfeit money (this is a primary school math problem that 85% of comrades did wrong. You can try if you don't believe me. Very classic.
A man came to the store with a hundred-dollar bill and bought something from 25 yuan (the purchase price of this thing from 25 yuan is 15 yuan). As the shopkeeper didn't have any change at hand, he took this hundred-dollar bill to the vendor next door and changed it for 100 yuan, and got the man's 75 yuan money back. The man took 25 yuan's things and 75 yuan's change and left.
After a while, the vendor next door found the shopkeeper and said that the hundred-dollar bill that the shopkeeper had just changed was counterfeit. The shopkeeper looked carefully and found that it was counterfeit money. The shopkeeper had to find another real hundred-dollar bill for the vendor.
Q: How much did the shopkeeper lose in the whole process?
2. There are 10 children playing hide and seek, and four children have been found. How many children are hiding and not being found?
3. There are 10 people crossing the river. There is a boat in the river, which can take up to five people at a time. How many times do you have to cross it?
Fourth, guess mathematical terms.
① 5、4、3、2、 1
Bye, mom.
(3) see who is strong.
(4) completely destroyed
⑤ Cheating in the exam
⑥ Members
Fifth, enter a Chinese character.
① 30 days ÷2
② 72 hours
③ 24 hours
④ Nine plus nine on the left and ninety-nine on the right.
Interesting exercise answer:
Interesting topic 1
Answer: 90 yuan. Whether this topic is right or wrong has little to do with age, but parents are more likely to make mistakes than students.
When you think about who should own this 100 yuan and turn around between different people, maybe your mind is already in a mess. We might as well solve this problem through mathematical thinking. This problem is solved by hypothesis, which is very beneficial to learning mathematics.
We assume that this 100 yuan is true, so the shopkeeper earned 10 yuan in the process, but in fact this 100 yuan is false, so 100- 10=90 yuan.
Interesting topic 2
Answer: Five answers.
Many children will answer six. When you ask him to think again or order him, he may find that it should be five, and then say that he was not careful. In fact, this is a matter of habit. There are many similar problems in mathematics learning. Most children will make mistakes at first, but after a while, some children will not make mistakes again, and some children will keep making mistakes. At this time, it is no longer just a careless problem, but also careful and rigorous thinking.
Interesting topic 3
Answer: 3 times.
Many people will take it for granted that "10÷5=2". Similar to the above question, it needs to be considered. After passing five people first, someone needs to come back to pick up the rest, and the boat won't come back by itself.
Interesting topic 4
Answer:
① Countdown ② Denominator ③ Proportion ④ Division ⑤ False fraction ⑤ Center of the circle.
Interesting topic five
Answer:
① Fat ② Crystal ③ Sky ④ Cypress
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