I found a problem when I was doing my homework today. This is the cycle in life.

What is a circle in life, that is, what is the circumference, area and symmetry axis of a circle in life, that is, the application of circle knowledge in life.

In our real life, there are many places where circles are needed. As long as you observe carefully, you will find it. Although I don't know how much you know about circles, today I will tell you what I know. As far as I know, the distance traveled by the wheel is the circumference of this circle. The route that the minute hand of the clock passes is the circumference of the clock face; The length of the cloth edge around the round dining table is also the circumference of the table top; The bracelet that people often wear on their hands also contains knowledge about the circumference ... it's really too much. I only said a little, and the rest will be observed by you, a master.

The circular area is actually very simple, as long as you can observe it and your eyes are brighter. The size of the round table is also the area of the round table; The size of the surface swept by the hour hand is also the area of this clock; There is also a possibility that is rare to everyone, that is, to tie the cows up with ropes to eat grass, and to find the maximum range of grazing for the cows, that is, to find the area of a circle. This is what I summed up.

Also, a circle has countless axes of symmetry, remember!

2

Today, I was stumped by a math problem. The question is this: "There are two bookcases in the school reading room. There are three times as many books in cabinet A as in cabinet B. Book lending in cabinet A 170, and book lending in cabinet B 10. At this time, the books left in the two cabinets are just equal. How many books are there in each cupboard? " After reading the question, I scratched my head and chin, but I couldn't think of a solution to the problem. Suddenly, my brother came. After reading the topic, he said, "This is a problem of difference times, mainly to find the difference times." After listening to it, I suddenly realized that I had listed the formulas at once.

three

Today, I was stumped by another math problem. The topic is like this: "The tiger heard talking about bullets outside the enemy window: one person said that everyone would return 45 bullets and get 260 bullets. Another person said, everyone carries 50 yuan, and 200 extra rounds. How many enemies are there? How many bullets? "

I thought hard and kept drawing on the draft, but I had no clue. Grandpa came up to me and said, "This is profit and loss problem. There is no trick, just (260-200)÷(50-45).

four

Today is Friday, and the test paper has been handed out. When I saw the results, I couldn't believe my eyes, only 86 points short. I am really ashamed and envious to see that others got a score of 100. I wish I could get a score of 100. But I blame myself for being careless, and I also blame myself for suddenly having a stomachache before I finished checking the first half of the test paper. I really don't know what happened. And I clearly found a problem wrong, but I didn't have time to correct it. The question is 4 points. If I add up the scores of this question, I can get 90 points. This exam taught me a lesson: don't eat anything except dinner before the exam. And the check is to write quickly and carefully, don't write typos, or the right one will become wrong, and count it several times. Write the answer quickly and not carelessly, because there is still time to check later.

I will work harder this month, because I will face a final exam instead of a quiz. I will definitely work hard and try my best to get better results in the exam.

five

We had a monthly exam the other day. I was very nervous after I finished my math exam, and I was worried that I would not do well in the exam!

The results came out yesterday, and I can't wait to know my own results. At 95 minutes, I finally breathed a sigh of relief. I finally put down a heavy stone. After the papers were handed out, I carefully analyzed the reasons for the mistakes as before. I sighed deeply and said, "Ah, I shouldn't be wrong in the two questions, and I believe that I can get a 100 score." However, I am so careless, as if I were going to make a few mistakes! I think: I must remember this lesson and let it remind me at all times that I will not be so careless in the next exam, and I must get the best "100"!

From this math monthly exam, I understand that no matter what I do, I must believe in myself and be a confident and good student.

six

Today, my father and I came to Guangzhou. First, let's buy clothes for dad. Dad picked out a dress that he particularly liked. It's just a 20% discount on the National Day special. Dad asked me that the price of a dress is 150 yuan, and a 20% discount is equivalent to multiplying the price of a dress by 0.8. Do you know how much a dress costs? I think: 150*0.8, first consider 0.8 as 8, then calculate the result by integer multiplication, and finally see how many decimal places a factor * * * has, so start from the right of the product number and point to the decimal point. The result is 120 yuan. I replied excitedly that the price of this dress after 20% discount was 120 yuan. Dad asked me again, "Usually when one number is multiplied by another, the product must be greater than the factor, but why is the product of this question greater than one of the factors?"

I think, in class, the teacher said. I said confidently, "The product of a number multiplied by more than 1 is less than the original number. Dad said, that's a coincidence. So is there such a rule for division? " "Of course, when the dividend is greater than 0 and the divisor is greater than 1, the quotient is less than the dividend. When the dividend is greater than 0 and the divisor is less than 1, the quotient is greater than the dividend. " Dad said, "Then I'll test you again. This dress is 50% off the original price in 200 yuan. What's the current price? My quick answer: "100 yuan". Dad said happily, "My daughter has learned to draw inferences from others! " "

After buying clothes, we went to the underground supermarket. My dad told me: "The dairy products in the store are all on sale. If you buy two boxes, how much discount? " I said, "I don't know." Dad said, "buy two and get one free, that is, spend two boxes of money to buy three boxes of milk." A box of 50 yuan is equivalent to spending 1 yuan on 150 yuan's milk. Then dividing 100 by 150 is equivalent to his discount. The result was about 30% off. You got it? "I said," I see. "

It is increasingly found that mathematics is used to solve problems in life!