计算：．-九年级数学

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• 计算：﹣（）=（）．-八年级数学
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• 计算：．-八年级数学
• 化简：=（）-九年级数学
• （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：．-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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