ko vì a / 6
b / 6
thì a - b không chia hết cho 6
![](https://olm.vn/images/avt/avt7/avt689907_60by60.jpg)
![](https://olm.vn/images/avt/avt9/avt304909_60by60.jpg)
![](https://olm.vn/images/avt/avt6/avt464136_60by60.jpg)
![](https://olm.vn/images/avt/avt9/avt1079449_60by60.jpg)
![](https://olm.vn/images/avt/avt8/avt1254368_60by60.jpg)
![](https://olm.vn/images/avt/avt2/avt1265682_60by60.jpg)
![](https://olm.vn/images/avt/avt173370_60by60.jpg)
![](https://olm.vn/images/avt/avt9/avt1251289_60by60.jpg)
![](https://olm.vn/images/avt/avt3/avt1231213_60by60.jpg)
![](https://olm.vn/images/avt/avt0/avt1258000_60by60.jpg)
Goi thuong trong phep chia la P
ta co : a : 6 = P ( du 2 )
=> a = P . 6 + 2
Vi P . 6 \(⋮\)6 nhung 2 khong chia het cho 6
b : 6 = P ( du 5 )
=> b = P . 6 + 5
Vi P . 6 \(⋮\)6 nhung 5 ko chia het cho 6
Suy ra : a - b khong chia het cho 6