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已知x2-4x+1=0,求x2+x-2的值.
题中是X的平方,求的是X的平方与X的负2次方的和.
人气:452 ℃ 时间:2020-02-05 19:31:02
解答
x^2-4x+1=0所以x^2+1=4x所以 x+1/x=4
然后x^2+x^-2=(x+1/x)^2-2=4^2-2=14
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