已知x+1/x=3,求x2十1/x2的值?
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已知x+1/x=3,求x2十1/x2的值?已知x+1/x=3,求x2十1/x2的值? 已知x+1/x=3,求x2十1/x2的值?x+1/x=-3(x+1/x)^2=9x^2+2+1/x^2=
已知x+1/x=3,求x2十1/x2的值?
已知x+1/x=3,求x2十1/x2的值?
已知x+1/x=3,求x2十1/x2的值?
x+ 1/x = - 3
(x + 1/x)^2 = 9
x^2 + 2 + 1/x^2 = 9
x^2 + 1/x^2 = 7