下列计算中，正确的是（）-九年级数学

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• 计算：-九年级数学
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• 计算与化简（每题4分，共8分）小题1:⑴小题2:⑵-九年级数学
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• 有意义，则实数x的取值范围是。-八年级数学
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• 先化简，再求值：，其中-九年级数学
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• （本题4分）先化简，再求值：，其中.-九年级数学
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