-2小于等于x小于4,化简|x+2|-3|x-4|
问题描述:
-2小于等于x小于4,化简|x+2|-3|x-4|
答
-2 ≤ x ≤ 4
所以|x + 2| -3|x - 4|
= (x + 2) - 3(4 - x)
= x + 2 - 12 + 3x
= 4x - 10
答
-2小于等于x小于4,x+2>0,x-4