计算-九年级数学

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• 计算：小题1:；小题2:-九年级数学
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• 当时，二次根式无意义.-九年级数学
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• (本题8分)先将÷化简，然后自选一个合适的x值，代入化简后的式子求值。-九年级数学
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• 计算：．-九年级数学
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• 对描述错误的一项是（）A．面积为2的正方形的边长B．它是一个无限不循环小数C．它是2的一个平方根D．它的小数部分大于2－-八年级数学
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• （本题满分8分）化简二次根式：小题1:（1）小题2:（2）（＜0）-九年级数学
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• 先化简，再求值：，其中a=-1.-九年级数学
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• 计算：＝.-九年级数学