4-x<2x+1
2x+x>4-1
3x>3
x>1
x-1/2<4x-5/3
两边乘6
3x-3<8x-10
5x>7
x>7/5
-(x-1)/2<3
两边乘(-2),不等号改向
x-1>-6
x>-5
解:4-x<2x+1
移向-3x<-3
x>1
同理x-1/2<4x-5/3
3x>7/6
x>7/18
同理 -(x-1)/2<3
x>-5
2x+x>4-1
3x>3
x>1
x-1/2<4x-5/3
两边乘6
3x-3<8x-10
5x>7
x>7/5
-(x-1)/2<3
两边乘(-2),不等号改向
x-1>-6
x>-5