1. As a child in grade six, you should have learned arithmetic progression's summation formula. ...

Although it has been a long time since I graduated from primary school, I still remember that I studied in the third grade.

Of course, it's understandable if you haven't taken any form of Olympic math class.

(65438 of 99+0+98 of 99) times 98 divided by 2=49.

2. 165438+ 10 has a total of * * 30 days (you won't tell me that you think 165438+ 10 has 3 1 day, so you won't do this problem ...)

One fifth of the cloudy days are 6 days, and half of the rainy days are 9 days, so the sunny days are 15 days.

The fifth question was recited when preparing for the Chinese knowledge contest.

Part I: Going on the Long March

Downward: ZhangChang goes up and down.

The first part hopes that the bean sprouts will grow (I often have a holiday when I study often), and the second part hopes that the bean sprouts will grow (grow).