1. These questions are brushed when the foundation is good, and they can generally be worked out directly in the examination room.

For most students, changing people is the most time-saving and labor-saving method. Do it for a while when you get the topic, and then bring in all four options to see which one can do it. It is not advisable to fill in the blanks.

3. Fill in the blanks and choose the commonly used half-doing and half-covering method: calculate everything that can be calculated according to the conditions, and then exclude some situations that do not meet the conditions. On this basis, let's see if we can work out the answer. You can't just guess the answer, you have to guess the special situation.

4. If there are similar problems in the big topic, you can learn from their ideas.

I hope I can help you.