|x+1|+|x-3|=6设x1+1=0 x2-3=6x1=-1 x2=3当x<-1时-(x+1)-(x-3)=6-x-1-x+3=6 x=-2当-1≤x≤3时:x+1-(x-3)=6 4=6不成立 ,无解x>3时x+1+x-3=6 x=4综上-2和4是方程得解。|2x-3|>5当2x-3为负,那么-(2x-3)>5 x<-1当2x-3为正,那么2x-3>5 x>4综上x<-1或x>4