4-x

问题描述:

4-x

4-xx-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-35x>7
x>7/5
-(x-1)/2<3
两边乘(-2),不等号改向
x-1>-6
x>-5

4-x移向-3x 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-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