(10分)观察下列等式：①；②；③；……回答下列问题：小题1:（1）利用你观察到的规律，化简：小题2:（2）计算：-九年级数学

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• 若成立，则-九年级数学
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• 计算：-九年级数学
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• ①；-九年级数学
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• -九年级数学
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• ②-九年级数学
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