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初中数学：怎么求2x-y的平方根？二次根式的性质，2020郑州月考
初中数学：怎么求2x-y的平方根？二次根式的性质，2020郑州月考
实数，无理数，平方根，立方根，二次根式，常考题培优专练337/419
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