Math exercises are just your brain. If we rely on answers as a way of thinking, it will lead to: first, single thinking; Second, we can't expand our thinking.

You said "it's easy to see the answer" because your understanding of knowledge is not systematic enough and you don't have enough patience. In short, you should practice more. As long as the basics are thoroughly studied, the difficulties will be solved.

I'm from Sichuan, and my teacher told us to practice more, which can improve efficiency and avoid analogy. I suggest you study.

Only by exercising more can you become sharp and agile. Don't rely too much on the answer, learn the summary method by yourself (mathematical thinking) and consider the problem comprehensively.

You are a senior in high school, and the college entrance examination is just around the corner. It is not recommended that you buy more homework.

If you have to, I suggest you buy some college entrance examination information volumes in Liaoning province (because you said you are from Liaoning) or the whole country. The advantage of this is that the problem is systematic and comprehensive.

Do it yourself, don't rely on the answer first, stop thinking and do other questions in less than ten minutes. It is best to test the learning effect regularly.

Hope to help you, hope to collect!