问题描述: 若x²-3x+1=0,计算x²+1/x²+3的值 1个回答 分类:数学 2014-10-27 问题解答: 我来补答 x^2 - 3x + 1=0 (divide x)x - 3 + (1/x) =0x+ (1/x) = 3x^2 + (1/x^2 ) = (x + (1/x) )^2 -2 =3^2 -2 =7therefore,x^2 + (1/x^2 ) + 3 = 7 + 3 =10 展开全文阅读