I made a mistake in the topics of these meetings. My method is to check it again. You might say it's normal not to check it a few times. Because when we check, we often check according to the idea of doing the problem before. At this time, we must try to change our thinking and check it again in a different way! (Time permitting). If you really can't think of other methods, I suggest you check every link of the topic, try to get rid of the idea of the first time, don't take it for granted that it is so significant, and be sure to get the exact answer on the draft paper. The last point: Be careful when you solve the problem for the first time, answer it step by step, and try to calculate with less care! Hope to adopt!