解不等式组(1){1+2x>3+x,(2) {2-x≤-1,(3){3(x-1)<4x-2,5x≤4x-1; 3<x-1
5个回答

(1){ 1+2x>3+x-----------(1)

5x≤4x-1-------------(2)

解(1)得,x>2

解(2)得,x≤-1

无解

(2) { 2-x≤-1------------(1)

3<x-1--------------(2)

解(1)得,x≥3

解(2)得,x>4

即 x>4

(3){ 3(x-1)<4x-2---------------(1)

-x/5>x+1/2-------------------(2)

解(1)得,3x-3<4x-2

x>-1

解(2)得,-2x>10x+5

12x<-5

x<-5/12

即 -1<x<-5/12