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八年级数学：怎么求a²-b²的平方根？二次根式的性质经典常考题
八年级数学：怎么求a²-b²的平方根？二次根式的性质，经典常考题
实数，无理数，平方根，立方根，二次根式，常考题培优专练361/419
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