化简：-=（）。-九年级数学

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• 计算：（）。-九年级数学
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• 对于题目：“化简并求值，其中”小明解答如下：解：原式==，当时，原式=。你认为小明的解法正确吗？若不正确，请写出正确答案。-九年级数学
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• 计算：=（）。-九年级数学
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• 化简：（）。-九年级数学