x^2-5x+1=0
x^2=5x-1
把x^2=5x-1代入x^2-1/x^2,得5x-2/5x
x^2-5x+1=0,求分式x^2-1/x^2的值
x^2-5x+1=0,求分式x^2-1/x^2的值
要理由
要理由
数学人气：129 ℃时间：2020-03-22 22:05:51
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