y=x(2-x)/|x-1|-1的增区间减区间
问题描述:
y=x(2-x)/|x-1|-1的增区间减区间
答
x>1时,y=x(2-x)/(x-1)-1=-x(x-1-1)/(x-1)-1
=-x+x/(x-1)-1=-x+(x-1+1)/(x-1)-1=-x+1+1/(x-1)-1=-x+1/(x-1)
当x增大时,y减小,∴y在(1,+∞)上是单调递减函数
当x