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八年级数学：若根号(2a-1)²=1-2a，怎么求a的取值范围？二次根式
八年级数学：若根号(2a-1)²=1-2a，怎么求a的取值范围？二次根式
实数，无理数，平方根，立方根，二次根式，常考题培优专练112/419
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