若y满足不等式组-4若y满足不等式组-4
若y满足不等式组-4y满足不等式组-4
-y-4 2+y
-4 0y+4的绝对值=Y+422-Y<0 负 =>2-y的绝对值=Y-2所求=(Y+4) - (Y-2)=6...ANS