计算（6分）：-八年级数学

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• ;="_____"__-九年级数学
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• 先化简，再求值：，其中-九年级数学
• 计算：-九年级数学
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• 计算：（1）；（2）。-八年级数学
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• （1）计算：（2）已知：，求的值．-八年级数学