│x-2│-│2x+5│>2x
分三段讨论
2x+5
-2-x+2x+5>2x
xx2x
=> 2-x-2x-5>2x
x-5/2《x2时
│x-2│-│2x+5│>2x
=x-2-2x-5>2x
x