先化简，再求值-八年级数学

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• 若有意义，则的取值范围是（）A．B．C．D．一切实数-九年级数学
• 若，则=.-八年级数学
• 无理数是()A．无限循环小数B．带根号的数C．除有限小数以外的所有实数D．除有理数以外的所有实数。-八年级数学
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• 的平方根是（）A．B．C．D．-八年级数学
• 9的平方根等于()A．±3B．－3C．3D．81-八年级数学
• 当时，化简的结果是．-九年级数学
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• 计算：①②-八年级数学
• 计算：-八年级数学
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• 比较大小：（填“＜”、“＞”、“=”）-八年级数学
• .当x满足时，式子有意义-八年级数学
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