1. Tomorrow, our whole school will go for an autumn outing. I went to Shengjia supermarket to buy a lot of snacks in the evening. I bought two packs of Hijiro fruit jelly (2 yuan), a bottle of 600ml Sprite (2.6 yuan), a strip of Yida chewing gum 13.5g(2.2 yuan) and a bucket of Pinke potato chips with tomato flavor (13. I used 2+2.6+2.2+13.5+2.3+3.2 = 28.6 yuan.

I really hope tomorrow's autumn outing will come soon!

I saw a puzzling math problem tonight. The topic is: 37 students want to cross the river. There is an empty boat at the ferry that can only take five people. How many times must they cross the river with this boat at least?

Careless people often ignore the "empty boat", that is, forget to have a gondola, so they can only take four people at a time. In this way, 37 people subtract one rowing classmate, leaving 36 students, 36 divided by 4 equals 9, and the classmate who worked as a boatman on the other side for the last time also landed 4, so it takes at least 9 trips.

3. In the evening, I saw a difficult 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.

How to keep a diary:

As the name implies, write a diary once a day. So the diary can only write about the day? That's not true. Diary can also be written in the past. If there is nothing to write in a single-page diary, or what happened in the past is not written down in time, you can write it down later after recalling and thinking. What you write doesn't need to be decorated with good phrases. After all, it's just that what you do is expressed in words and kept for one day.

As long as it is coherent and comfortable to read. Do whatever you want-write whatever you think, and create a relaxed reading environment is enough. Although the diary may not only write about the day, it is still written on the same day. Don't put off a day's work until later. Diary usually consists of two parts: the end of the book and the text. Diaries often record what they see, hear, do and think in the first person.

The format of Chinese and English diaries is roughly the same. The end of an English diary is dedicated to writing the date, week and weather of the diary. The date and week are in the upper left corner. Write down the weather in the upper right corner.