Tuesday, August 9
In the evening, I saw a problem in the Olympiad Book: the number of apple trees in the orchard is three times that of pear trees. Master Lao Wang fertilizes 50 apple trees and 20 pear trees every day. A few days later, all the pear trees were fertilized, but the remaining 80 apple trees were not fertilized. Excuse me: How many apple trees and pear trees are there in the orchard?
I am not intimidated by this question, but it can stimulate my interest. I think the apple tree is three times as big as the pear tree. If two kinds of trees are to be fertilized on the same day, Master Lao Wang will fertilize "20×3" apple trees and 20 pear trees every day. In fact, he only fertilizes 50 apple trees every day, which is 10, and the last 80 trees. Therefore, Master Lao Wang has been fertilizing for 8 days. 20 pear trees a day, 8 days is 160 pear trees. According to the first condition, there are 480 apple trees. This is to solve the problem with the idea of hypothesis, so I think the hypothesis method is really a good way to solve the problem. In the math class that day, Mr. Wang said this: "The class is wonderful because of mistakes." -short and meaningful.
In the first half of the sixth grade, we learned to solve application problems in proportion. Through the study of several examples in the book, we come to the conclusion that direct scale images all rise or fall linearly. Just as we were about to solve the next problem, I asked: Why can't it be a straight line instead of a broken line that fluctuates up and down? The next time, we spent in solving my problems. After arguing for a while, Zhang Yuxuan was a little confused. I found that other students were also slightly confused. The teacher asked me to draw a picture on the blackboard, and then we understood what she meant: if the data on the coordinate axis are not arranged in order, the image will not rise or fall in a straight line. It turns out that I neglected the characteristics of the number axis.
Doesn't this matter verify that sentence? Because of my mistakes in class, the whole class has a deeper understanding of the number axis and positive proportion; Therefore, it also made me realize that mistakes are not terrible. The important thing is to bring it up and let everyone solve it together. From this, I understand that when answering questions, don't hesitate for fear of making mistakes-the class will be wonderful because of mistakes.
This afternoon, my mother and I went shopping in the supermarket.
When we finished buying what we needed, we were about to leave. I saw sausages on the shelf, so I asked my mother to buy some sausages, and my mother agreed. But just after a few steps, I saw a package with the same brand and weight on the shelf, which contained 10 pieces at 4.30 yuan each. Do you want to buy a pack or a slice? I hesitated. Suddenly, my mind turned and I understood. Just compare and see which one is cost-effective. So I started to calculate: if I buy 10 pieces in retail, each piece costs 40 cents, which is equal to 4 yuan, and the whole package costs 4.30 yuan, which is 3 cents more, so I decided to buy it in bulk. I told my mother the process of my calculation, and my mother praised me for my love of brains.
Sorry, I didn't.