当x＜-3时,
|x+3|+|x-2|+|x-5|
=-x-3+2-x+5-x
=4-3x
当-3≤x≤2时,
|x+3|+|x-2|+|x-5|
=x+3+2-x+5-x
=10-x
当2≤x≤5时,
|x+3|+|x-2|+|x-5|
=x+3+x-2+5-x
=6+x
当x＞5时
|x+3|+|x-2|+|x-5|
=x+3+x-2+x-5
=3x-4