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
• ．-九年级数学
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• 要使式子有意义，a的取值范围是（）A．B．C．a≤2D．a≥-九年级数学
• 先化简，再求值：，其中a=-1.-九年级数学
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• 小题1:（1）计算：．小题2:（2）解方程：-九年级数学
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• 化简-八年级数学
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• （本题满分8分）小题1:（1）小题2:-九年级数学
• 若=1－a，则a的取值范围是.-九年级数学
• 计算：-九年级数学
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• 化简▲．-九年级数学
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• 若最简二次根式和是同类二次根式，那么a=；b=-九年级数学
• 已知，则x的取值范围是-九年级数学
• 计算：=-九年级数学
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