若，，则的值为．-八年级数学

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• ①；-九年级数学
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• （2011•温州）（1）计算：；（2）化简：a（3+a）﹣3（a+2）．-八年级数学
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• 计算：．-八年级数学
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• 当时，二次根式有意义．-九年级数学
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• 计算：_▲_；-九年级数学
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• -九年级数学
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