Mathematical papers

In life, there are mathematics everywhere, in the supermarket, in the restaurant, at home, in the school......... are inseparable from mathematics. I have also had several personal experiences with mathematics. I picked two of them to tell everyone.

I remember the third grade. Once, my mom and I went to the supermarket. The supermarket is now engaged in the Spring Festival discount activities. The discounts for each item are different. I took a look at a bag of Want Want spree, the net content is 628 grams, the original price of 35 yuan, now hit 20% off, but how to calculate the 20% off? I asked my mother. My mother told me that a 20% discount is multiplied by 0.8, which is 35*0.8=28. I suddenly realized. I am going to buy this bag of Want Want Gifts, but my mother told me that the Wangwang Gift Package may be cheaper. I have to go back. Walking and walking, sure enough, I saw the sale of Want Want spree, the net content is 650 grams, the original price of 40 yuan, and now also hit 20% off. This time, I made a mistake, the net content is different, the original price is also different, which is worthwhile? I asked my mother again. My mother told me that 35*0.8=28, 40*0.8=32, one bag is 628 grams, the current price is 28 yuan, the other bag is 650 grams, the current price is 32 yuan. With 28/628≈0.045, 32/650≈0.049, 0.049>0.045, so the second bag was a little bit cheaper, so we bought the second bag. Through this shopping, I know how to calculate the number of discounts, and how to calculate which items are more cost-effective.

I remember the fourth grade. Once, I went out to play with a friend. My friend’s mother gave us a question: 1~100, each person can report 1 number, 2 numbers, 3 numbers, who will report to 100 first. Who wins. When the voice just fell, I thought about how to win. I think: This is definitely a mathematical strategy problem. You can’t blindly report it. There must be a math problem. Use 1+3=4,100/4=25, I can’t When the first one is reported, it can only be the last one. She reports X numbers. I will report the number and I will win. I am suspicious and go to her to report. Obviously, she did not think about the strategy of winning. I used my method to report with her. At the end, I actually reported 100, and I won. It turns out that this mathematical problem is a typical countermeasure problem that needs to be considered in order to win. In the sixth grade, I also learned this kind of knowledge. It is even harder. Through this tour, I liked the countermeasures, and I also loved thinking and looking for mysteries in mathematics.

Mathematics, like a peak, goes straight into the sky. It feels very relaxed when you first climb, but the higher we climb, the steeper the mountain becomes and the more fearful it is. At this time, only those who really love mathematics will have the courage to continue climbing. Therefore, those who stand on the peak of mathematics are all from the heart who like mathematics. Those who stand at the foot of the peak cannot see the peak. Only by discovering mathematics and feeling mathematics in life can you make your vision more open!

First day: Lu Zezhen