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初中数学：怎么求代数式x4-3x²-3x+1的值？先消根号，整体代入法
初中数学：怎么求代数式x4-3x²-3x+1的值？消根号整体代入法
实数，无理数，平方根，立方根，二次根式，常考题培优专练240/419
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