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初中数学：3a+1的立方根是-2，2b-1的算术平方根是3，怎么求值？
初中数学：3a+1的立方根是-2，2b-1的算术平方根是3，怎么求值？
实数，无理数，平方根，立方根，二次根式，常考题培优专练405/419
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