2(x^2+1/x^2)-3(x+1/x)=1
2(x^2+1/x^2+2-2)-3(x+1/x)=1
2(x+1/x)^2-4-3(x-1/x)=1
把(x+1/x)看作z
我们可以得出2z^2-4-3z=1
求出z即求出(x+1/x)然后求出x
(x^2就是x的平方)
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