Big questions are basically those kinds of questions, trigonometric functions, exponents, probabilities, series, and the latter two kinds of questions are generally conic curves and abstract functions or other functions. The big questions ensure that the first four questions should be mastered. In order to remedy these problems, we must do this and find ways to do it.
For example, how to prove that a straight line is parallel to a surface by setting several lines? First take a ruler on the paper, translate the line to the surface to find the parallel line (this method is definitely possible), and then prove it after finding the parallel line. How to prove it? Is to find two ways: to construct a parallelogram, or to construct a midline (if knowledge is popular, find a book), then find a way and prove it. There is another way to improve Li Ji's score. The process of looking at the answer proves that parallel lines and planes cannot miss any conditions (if they are missed, points will be deducted, for example, line segment A is not on plane ABC).
It also has the function of doing this. Just think about what to ask this question and calculate it step by step.
The important thing is not to do more problems, but to master the methods of doing problems, what problems have what kind of solutions, and then master the solutions by doing problems.
At the same time, there is a problem of expression. If you can do it but can't say it, you're half eaten. In this case, it is suggested to look at the answers, find out the main points of the answers, which ones must be written and which ones don't need to be written, and then slowly master the questions.
Mathematics says that doing problems is not to get the sea of problems, but to get the methods. The problem you work out is usually forgotten the next day, but the solution will never be forgotten, so you can't go wrong even if you do it many times!