计算：=（）。-九年级数学

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• 计算：-八年级数学
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• 化简可得[]A.-2B.C.2D.-八年级数学
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• （1）（2）-八年级数学
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• 化简的结果是（）．-八年级数学
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• 不用计算器，比较和的大小。-八年级数学
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• 的值是[]A.7B.-1C.1D.-7-八年级数学
• 计算：-八年级数学
• 计算的值是（）。-八年级数学
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