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九年级数学：怎么求b/a+a/b的值？一元二次方程常考，别忘第一步
九年级数学：怎么求b/a+a/b的值？一元二次方程常考，别忘第一步
初中数学，解一元二次方程，根的判别式，韦达定理，中考培优真题50/168
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