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在遇到含有绝对值的式子时,同学们颇感为难.要揭开绝对值神秘的面纱,非常有力的武器是:分类讨论.怎样恰当地运用分类讨论的方法来解决这种问题呢?下面例谈如何突破难关,揭开绝对值的面纱.
When encountering formulas containing absolute values, the students were embarrassed. To unveil the mysterious veil of absolute value, a very powerful weapon is: Classified discussion. How to properly use the method of class discussion to solve this problem? Here is an example of how to break through the difficulties and uncover the veil of absolute value.