-九年级数学

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• 为任何实数，则的最小值是__________。-八年级数学
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• 计算：=-八年级数学
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• 计算-八年级数学
• 9的算术平方根是A．－9B．9C．3D．±3-九年级数学
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• 若实数x，y满足，则yx的值为（）A．B．3C．－D．－3-八年级数学