已知实数X满足X+1/X=3,则X^2+1/X^2的值为

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已知实数X满足X+1/X=3,则X^2+1/X^2的值为已知实数X满足X+1/X=3,则X^2+1/X^2的值为已知实数X满足X+1/X=3,则X^2+1/X^2的值为x+1/x=3(x+1/x)^2

已知实数X满足X+1/X=3,则X^2+1/X^2的值为
已知实数X满足X+1/X=3,则X^2+1/X^2的值为

已知实数X满足X+1/X=3,则X^2+1/X^2的值为
x +1/x =3
(x +1/x)^2 =9
x^2+1/x^2 + 2=9
x^2+1/x^2 =7