9 vien ho? Chia lam 3 phan 3 - 3 - 3
- Lay 2 phan dau can voi nhau, neu bang nhau thi vien bi can tim nam trong phan thu 3
Lay 2 trong so 3 vien phan thu 3 len can, neu bang thi vien bi can tim la vien con lai, neu ko thi vien nao nang hon vien do la vien can tim
- Neu 2 phan dau ko bang, ben nao nang hon thi ben do co chua vien bi can tim
Lay 2 trong so do len can, tuong tu nhu tren