计算：（+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
• 计算：-八年级数学
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• 计算：。-八年级数学
• 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
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• 化简：-八年级数学
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