（2011•毕节地区）-八年级数学

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• 计算：．-八年级数学
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• -八年级数学
• 计算：．-八年级数学
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• （1）（2）-八年级数学
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• 计算=___________．-八年级数学
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• 计算：＝▲．-八年级数学
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• 计算：-九年级数学
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• 计算：-九年级数学
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• 计算：-八年级数学
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• （2011•成都）设，，，…，．设，则S=_____________（用含n的代数式表示，其中n为正整数）．-八年级数学