(1)丨x-1丨>4所以x-1>4或〈-4 x>3或〈-3(2)丨2x+1丨≤3所以2x+1≤3或≥-3 x≤1或≥-2(3)丨2x-5丨≥1所以2x-5≥1或≤-1 x≥3或≤2
丨x-1丨>4x-1<-4,x<-3x-1>4,x>5 丨2x+1丨≤3-3≤2x+1≤3-4≤2x≤2-2≤x≤1 丨2x-5丨≥12x-5≤-1,x≤22x-5≥1,x≥3
满脑壳问好