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初高中学生最易犯的两个错误，一些老师也会犯
我在网上看到一位老师没有讨论就算出结果，虽然结果是对的，但是过程绝对是错的，这个题目用加绝对值的方法书写会更加流利简便一点
除了求根公式，了解更多解方程的方法24/153
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