（）A．3B．C．D．9-九年级数学

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• ．-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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• 计算：＝.-九年级数学
• 计算：小题1:（1）；小题2:（2）．-八年级数学
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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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• 如果有意义，那么字母的取值范围是▲.-九年级数学
• （本题满分8分）小题1:（1）小题2:-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
• 比较二次根式的大小：-九年级数学
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• 化简：____________．-九年级数学
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• 实数在数轴上对应点的位置如图所示，则化简的结果为（）A．－2a+bB．2a－b+2cC．bD．－b-九年级数学
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