(1)当x<=2/3时|3x-2|=2-3x当 x>2/3时原式=3x-2 (2)当x<=-1时原式=-(x+1)+3-x=-x-1+3-x=2-2x当1原式=x+1+3-x=4当x>3时原式=x+1+x-3=2x-2
