When some students saw that they could do this problem, they relaxed their vigilance and skipped to answer it, resulting in unnecessary loss of points.

Suggestion:

The principle of "never skipping classes" is followed in peacetime and exams.

The writing of mathematical symbols is not standardized.

Mathematical symbols are strictly regulated, such as symbols (∈), sine (sin) and cosine (cos).

Suggestion:

Think clearly about the symbols you want to use, and then write. Pay attention to textbooks at ordinary times and don't let go of details.

calculation error

For example, the proof of mathematics, if one step is wrong, the later proof will not get points.

Suggestion:

(1) The mathematical calculation should be done carefully step by step.

② Check time must be set aside for big math problems.

③ Strengthen the calculation practice.