hi...de binh nhat chi trung si ne.dau tien ban vao tao dan
1 ban tao dan dau 9,0,1,4,5,6 duoc 60 so.
2 ban tao tiep 6 cham 3,4,5,,8,9,0 duoc 84 so
3 ban chep phan 84 so vao phan '' bo'' o dang 60 so duoc 11,12,16,17,61,62,66,67
4 ban lay 8 so nay - di 60 so thi dc 52 so lam giong phan 3 la dc...