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How about the midpoint in high school math textbooks?
The point in the canon is difficult, and the overall topics are as follows: easy and skillful, difficult and complicated, difficult and difficult. In other words, most simple questions have ingenious places in them, and most difficult questions have complicated steps, and the difficulty distribution is separated according to the three seven. For the eighth grade, the middle point of the book should not be used as a review material for the exam, but can be used for usual study and research.