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计算题速度慢，解题思路窄，一题多解帮你拓宽解题思路
给定已知条件，求代数式的值，既可以从已知条件入手，寻找要求的结果，也可以从要求的结果入手，转化为含有已知条件的形式，一题多解，提高解题速度，拓展解题思路
初三数学总复习数与式的运算7/36
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