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九年级：a，b是一元二次方程x²+x-1=0两个根，怎么求a4-3b的值？
九年级：a，b是一元二次方程x²+x-1=0两个根，怎么求a4-3b的值？
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19/168
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