-4≤x≤6
說明:
|x+2|+|x-4|≤10
(1) x≤-2時,
-(x+2)+[-(x-4)]≤10
-x-2-x+4≤10, -4≤x
(2) 4≤x時,
(x+2)+(x-4)≤10, x≤6
(3) -2<4時,<>≤x≤4
(x+2)-(x-4)≤10, 6≤10