化简：；=．-九年级数学

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• 计算：_▲_；-九年级数学
• 计算：（）。-九年级数学
• -九年级数学
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• -九年级数学
• 使有意义的的取值范围是(▲)．A．B．C．D．-九年级数学
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• 已知,则=________。-九年级数学
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• 使意义的x的取值范围是___________．-八年级数学
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• 化简：。-八年级数学
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• 一个三角形的三边长分别为厘米、厘米、厘米，求三角乡的周长和面积。-九年级数学
• -九年级数学