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为什么带绝对值的方程学生做不对？因为没有学会采用分类讨论法！
中学数学解题技巧，根据绝对值定义采用分类讨论法，巧解一元一次绝对值方程！
人教版七年级数学，最常考考易错重要知识点、竞赛、综合压轴题236/284
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