By the end of the last month, I_________all the CDs Of Justin Bieber.A．collectB．collectedC．have coll

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• 下列各式中正确的是[]A．B．=±3C．（﹣）2=4D．3﹣=2-八年级数学
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• 化简：-九年级数学
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• 计算：﹣（）=（）．-八年级数学
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• ．-九年级数学
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• 计算：．-八年级数学
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• （1）计算：+；（2）已知a=，求（）÷a的值；（3）解方程：x2﹣4x+1=0；（4）解方程：（x﹣1）2﹣3（x﹣1）=0．-九年级数学
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• 计算：﹣+2-九年级数学
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• 计算：．-九年级数学
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• -八年级数学
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• 化简：-九年级数学
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