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九年级数学：怎么求a+b-ab的值？一元二次方程，韦达定理常考题
九年级数学：怎么求a+b-ab的值？一元二次方程，韦达定理常考题
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126/168
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