下列计算正确的是（）A．B．C．D．（＜０）-九年级数学

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• 若，则=.-八年级数学
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• 计算：①②-八年级数学
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• 下列运算正确的是[]A．B．C．D．-九年级数学
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• 若，则。-九年级数学
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• 若m是的小数部分，则m的值是.-八年级数学