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x2-5x+1=0,求x4+1/x2
人气:375 ℃ 时间:2020-05-24 21:25:37
解答
x^2-5x+1=0
x^2+1=5x
(x^4+1)/x^2=(x^2+1)^2-2x^2/x^2
=(5x)^2-2x^2/x^2
=23x^2/x^2
=23
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