已知实数x满足x+ 1/x =3 则x²+ 1/x²的值为多少?

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已知实数x满足x+1/x=3则x²+1/x²的值为多少?已知实数x满足x+1/x=3则x²+1/x²的值为多少?已知实数x满足x+1/x=3则x²+1

已知实数x满足x+ 1/x =3 则x²+ 1/x²的值为多少?
已知实数x满足x+ 1/x =3 则x²+ 1/x²的值为多少?

已知实数x满足x+ 1/x =3 则x²+ 1/x²的值为多少?
把x+ 1/x =3两端平方,移项就会得到结果