1."√" indicates that the topic is correct. Mark "√" on the whole topic, indicating that it is all right. The place marked with "√" on the multi-level topic means that the part before "√" is correct.

2."?" It means that the topic is wrong. "?" The number marked at the end of the topic indicates that it is all wrong. Click on a specific location on the topic to show where there is a problem.

3. "﹋" wavy line. There is something wrong with the upper part of the wave line, which needs to be improved and perfected.

4. "△" or "∞" innovative symbols. The assignments in "△" and "∞" are creative and should be encouraged and praised.

Second, correct short comments.

1. Appreciate the comments. Add short comments to praise and encourage students' innovative ideas (such as wonderful solutions and unique solutions), new algorithms and new progress in the course of homework. For example: "neat handwriting", "clear thinking" and "unique thinking".

2. A short motivational comment. The combination of praise and criticism makes students willing to correct their mistakes. For example, "neatness of homework is a big step forward, but it would be better if you were more careful." ……"

3. Other short comments. According to the actual situation of students' homework, find problems and give guidance with short comments as needed. Adding short comments to students' homework is based on reality, not every student, but every homework. That is, "if it is appropriate to increase, it will increase, and if it is not appropriate to increase, it will not increase." For principle.