计算（）-八年级数学

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• 计算：-八年级数学
• 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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• 下列运算中，正确的是[]A．2+=2B．(x+2y)2=x2+4y2C．x8÷x4=x2D．÷=x-2-九年级数学
• 计算-=（）。-九年级数学
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• 比较大小：-（）--八年级数学
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• 化简（）。-九年级数学
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• 计算（）-八年级数学
• 计算：-八年级数学
• 下列实数运算中正确的是[]A.B.C.D.-八年级数学
• 已知5+的小数部分为a，5-的小数部分为b，求：（1）a+b的值；（2）a-b的值。-八年级数学
• 计算：-八年级数学
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• -九年级数学
• 下列计算正确的是[]A.B.C.D.-九年级数学
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• 下列计算中，正确的是[]A.B.C.D.-九年级数学
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• 计算：-八年级数学
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• 计算（1）+-=（2）-+=-八年级数学
• （1）（2）（3）（4）（5）（6）-九年级数学
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• 计算：=（）。-九年级数学
• 下列运算正确的是[]A．=-13B．-=1C．-3+=-2D．=±6-八年级数学