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初中数学：关于m的一元二次方程的根是2，怎么求n²+n-2的值？
初中数学：关于m的一元二次方程的根是2，怎么求n²+n-2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47/168
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