答案见图片。
(1)(x-1)(x-3)>0,x>3或x<1(2)(x-2)(x+3)<0,-3(3)|2x-1|<6,-6+1<2x<6+1,-2.5(4)|3x+4|<9,-9-4<3x<9-4,-13/3电脑不好打符号,自己看着改