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
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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; -x/5>x+1/2
(1){1+2x>3+x,(2) {2-x≤-1,(3){3(x-1)<4x-2,
5x≤4x-1; 3<x-1; -x/5>x+1/2
(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
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
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