x^2+1/x^2=7,x+1/x等于

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x^2+1/x^2=7,x+1/x等于x^2+1/x^2=7,x+1/x等于x^2+1/x^2=7,x+1/x等于(x+1/x)²=x²+2+1/x²=7+2=9所以x+

x^2+1/x^2=7,x+1/x等于
x^2+1/x^2=7,x+1/x等于

x^2+1/x^2=7,x+1/x等于
(x+1/x)²
=x²+2+1/x²
=7+2
=9
所以x+1/x=±3

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