计算下列各题（每题4分，共16分）小题1:（1）小题2:（2）小题3:（3）小题4:（4）已知，3<x<5，化简-九年级数学

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• 若代数式有意义，则x的取值范围是（）A．x≥﹣B．x≤C．x≥D．x≤--九年级数学
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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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• 使有意义的的取值范围是．-九年级数学
• 化简：＝．-九年级数学
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• ．当时，化简的结果是．-八年级数学
• 若则．-八年级数学
• 的相反数是，绝对值是。-八年级数学
• 如果，则（）A．a＜B．a≤C．a＞D．a≥-九年级数学
• 计算小题1:小题2:-九年级数学
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• (本小题10分)小题1:计算：小题2:（2）解方程：-九年级数学