4-x

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4-x4-x4-x4-x4-13x>3x>1x-1/2<4x-5/3两边乘63x-37x>7/5-(x-1)/2<3两边乘(-2),不等号改向x-1>-6x>-54-x移向-3xx>1同理x-1/2<

4-x
4-x

4-x
4-x4-1
3x>3
x>1
x-1/2<4x-5/3
两边乘6
3x-37
x>7/5
-(x-1)/2<3
两边乘(-2),不等号改向
x-1>-6
x>-5

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

4-x<2x+1的解集X>1
x-1/2<4x-5/3的解集X>7/18
-(x-1)/2<3的解集X>-5

1,移项:3x>3
系数化为一:x>1;
2,移项:3x>7/6
系数化为一:x>7/18
3,两边同乘以-2:x-1>-6
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