如果a=100，则的值为[]A.0B.C.D.-七年级数学

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• 计算：=（）。-九年级数学
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• 若，则的值为（）。-九年级数学
• 计算的结果是[]A.B.C.1D.-1-九年级数学
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• 计算：=（）。-九年级数学