问题描述: a difficult math questionx^2-3x+1=0,x^4+1/x^4=?,why? 1个回答 分类:综合 2014-09-20 问题解答: 我来补答 From the factor,we can get that x+1/x=3so (x+1/x)^2=x^2+1/x^2+2=9 x^2+1/x^2=7so (x^2+1/x^2)^2=x^4+1/x^4+2=49 x^4+1/x^4=47 展开全文阅读