已知x^0.5-x^-0.5=5,求x^2+(1/x^2)的值
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已知x^0.5-x^-0.5=5,求x^2+(1/x^2)的值已知x^0.5-x^-0.5=5,求x^2+(1/x^2)的值已知x^0.5-x^-0.5=5,求x^2+(1/x^2)的值x^0.5-x
已知x^0.5-x^-0.5=5,求x^2+(1/x^2)的值
已知x^0.5-x^-0.5=5,求x^2+(1/x^2)的值
已知x^0.5-x^-0.5=5,求x^2+(1/x^2)的值
x^0.5-x^-0.5=5
(x^0.5-x^-0.5)^2=5^2=25
x-2+x^-1=25
x+x^-1=27
(x+x^-1)^2=27^2
x^2+x^-2=27^2-2=727
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