不等号4!1
问题描述：
不等号4!1
x>1
求y=(2x^2-2x+1)/(1-x)最大值
-2根号2-2
答
y=-(2x^2-2x+1)/(x-1)
=-[2(x-1)^2+2(x-1)+1]/(x-1)
=-[2(x-1)+1/(x-1)+2]≤-[2√2+2]=-2根号2-2