1-sqr(x)/[1+sqr(x)]+sqr(x)+2求最值,

问题描述:

1-sqr(x)/[1+sqr(x)]+sqr(x)+2求最值,
rt

{1-sqr(x)/[1+sqr(x)]}之中1不在分母之中
1-sqr(x)/[1+sqr(x)]+sqr(x)+2
=1/[sqr(x)+1]+sqr(x)+1+1 (大于等于3)