已知，则的值等于[]A.6B.-3C.D.-八年级数学

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• 计算：=（）。-九年级数学
• 已知，则（）。-八年级数学
• 化简的结果是[]A.B.C.D.-八年级数学
• 化简的结果是[]A.B.C.1D.-1-八年级数学
• 计算：。-八年级数学
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• 方程－=0的解为（）A．x=2B．x=－2C．x=3D．x=－3-九年级数学
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• 解方程：=1﹣．-七年级数学
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