已知m,n 是方程x²-2x-1=0的两个根,且(7㎡-14m-a)(3n²-6n-7)=8,则a的值等于( )A.-5 B.5 C.-9 D.9
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![已知m,n 是方程x²-2x-1=0的两个根,且(7㎡-14m-a)(3n²-6n-7)=8,则a的值等于( )A.-5 B.5 C.-9 D.9](/uploads/image/z/2744702-62-2.jpg?t=%E5%B7%B2%E7%9F%A5m%2Cn+%E6%98%AF%E6%96%B9%E7%A8%8Bx%26%23178%3B-2x-1%3D0%E7%9A%84%E4%B8%A4%E4%B8%AA%E6%A0%B9%2C%E4%B8%94%287%E3%8E%A1-14m-a%29%283n%26%23178%3B-6n-7%29%3D8%2C%E5%88%99a%E7%9A%84%E5%80%BC%E7%AD%89%E4%BA%8E%28+%29A.-5+B.5+C.-9+D.9)
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已知m,n 是方程x²-2x-1=0的两个根,且(7㎡-14m-a)(3n²-6n-7)=8,则a的值等于( )A.-5 B.5 C.-9 D.9
已知m,n 是方程x²-2x-1=0的两个根,且(7㎡-14m-a)(3n²-6n-7)=8,则a的值等于( )
A.-5 B.5 C.-9 D.9
已知m,n 是方程x²-2x-1=0的两个根,且(7㎡-14m-a)(3n²-6n-7)=8,则a的值等于( )A.-5 B.5 C.-9 D.9
d
选d