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I am a senior three student. Is it necessary to have a wrong math book? Will it waste time?
Mathematics learning is actually a process of discovering what you can't do and turning what you can't do into a chance. In math review, many students brush the questions blindly and seldom spend time studying their own wrong questions, so they won't or won't make mistakes when they encounter similar questions.

Mathematics is the epitome of scientific thinking, and the effect of applying formulas alone is average. Many problems are dug everywhere, so we must pay attention to them. Moreover, mathematics questions are ever-changing, and the methods and combinations of solving problems are also very different. There is a perfect wrong problem book, which is very valuable for the research and reflection of wrong problems in mathematics.

The method of doing the wrong problem set can refer to your own preferences. It doesn't matter if you like copying questions or not cutting books. It is important to know how to use the wrong problem set.

Gather one's ideas together

The train of thought here refers to all your ideological activities when solving this problem, including your analysis of the subject conditions, preliminary ideas, derivation process and so on. In particular, the stuck and wrong parts should be recorded in detail.

It is strongly recommended that you don't ignore the calculation error. A student didn't realize the reason why he always lost points in his calculation until shortly before the exam. How terrible it would be if this mistake continued until the day of the exam!