计算：-八年级数学

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• 计算：-九年级数学
• 计算：=（）。-八年级数学
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• 下列等式成立的是[]A．B．2+4=6C．3×3=3D．-九年级数学
• 计算：-九年级数学
• 下面计算正确的是[]A.B.C.D.-九年级数学
• 化简：-八年级数学
• 计算的结果是[]A.B.C.D.-九年级数学
• 计算：（）。-九年级数学
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• 下列运算正确的是[]A.a+b-（a-b）=0B.C.（m-1）（m+2）=m2-m+2D.（-1）2009-1=2008-九年级数学
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• 计算：-八年级数学
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