(1)x<-1 |x+1|+|x-1|-|3x-6| =-x-1-x+1+3x-6 =x-5 (2)-1<x<1 |x+1|+|x-1|-|3x-6| =x+1-x+1+3x-6 =3x-4 (3)1<x<2 |x+1|+|x-1|-|3x-6| =x+1+x-1+3x-6 =5x-6 (4)x>2 |x+1|+|x-1|-|3x-6| =x+1+x-1-3x+6 =-x+6
化简|x+1|+|x-1|-|3x-6|
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