问题描述: 求函数y=(x^4+x^2+5)/(x^2+1)^2的最大值与最小值 1个回答 分类:数学 2014-12-05 问题解答: 我来补答 y=(x^4+x^2+5)/(x^4+2x^2+1) =(x^4+2x^2+1-x^2+4)/(x^4+2x^2+1) =1+(4-x^2)/(x^4+2x^2+1) =1+(5-(x^2+1))/(x^2+1)^2 =1-1/(x^2+1)+5/(x^2+1)^2令t=1/(x^2+1) ,0 展开全文阅读