|x-2|-|x-5|>x^2-8x+15
如果x<2:
2-x-(5-x)>x^2-8x+15
2-x-5+x>x^2-8x+15
x^2-8x+18<0
(x-4)^2+2<0
无解
如果2≤x≤5
x-2-(5-x)>x^2-8x+15
x-2-5+x>x^2-8x+15
x^2-10x+22<0
(x-5)^2<3
-√3<x-5<√3
5-√3<x<5+√3
又:2≤x≤5
∴5-√3<x≤5
如果x>5:
(x-2)-(|x-5)>x^2-8x+15
x-2-x+5>x^2-8x+15
x^2-8x+12<0
(x-2)(x-6)<0
2<x<6
又:x>5
∴5<x<6
综上:5-√3<x<6