问题描述: 化简/X+3/X+1,其中x=3-根号2的值 1个回答 分类:数学 2014-09-24 问题解答: 我来补答 x=3-√2(x-1-8/(x+1))/[(x+3)/(x+1)]=((x-1)(x+1)-8)/(x+1)/[(x+3)/(x+1)]=(x²-1-8)/(x+3)=(x²-9)/(x+3) =(x²-3²)/(x+3)=(x+3)(x-3)/(x+3) =x-3=3-√2-3=-√2 展开全文阅读