tim 2 so khi biet tong la 11992 biet hieu cua chung la hieu cua so lon nhat co bon chu so va so lon nhat co ba chu so.

Tong cua hai so la so chan lon nhat co bon chu so .Hieu cua hai so la so tron chuc lon nhat co 3 chu so Tim hai so do 

tong cua hai so la so nho nhat co bon chu so neu lay so lon chia so nho duoc thuong la so lon nhat co mot chu so tim so lon

tim tong cua 2 so thap phan biet so thap phan thu nhat co phan nguyen la so lon nhat co mot chu so va phan thap phan la so lon nhat co 2 chu so khac nhau , so thu 2 hon so thu nhat 17,3.

Tong cua hai so la so lon nhat co ba chu chu so ti so cua hai so la so chan lon nhat co mot chu so tim hai so do.

tong cua hai so la so lon nhat co bon chu so biet mot so hang cua tong la so nho nhat co ba chu so tim so hang con lai

Tong cua bon so tu nhien la so lon nhat co bay chu so. Neu xoa di chu so hang don vi cua so thu nhat thi duoc so thu hai. So thu ba bang hieu cua so thu nhat va so thu hai. So thu nhat la tich cua so be nhat co ba chu so va so lon nhat co bon chu so. Tim so thu tu.

HSG

Tong cua bon so tu nhien la so lon nhat co 7 chu so .Neu xoa di chu so hang don vi cua so 1 thi duoc so 2. so thu 3 bang hieu cua so 1 va so 2.so be nhat la tich cua so be nhat co ba chu so va so lon nhat co bon chu so .tim so thu 4

2: ban An co 170vien bi gom 2 loai :bi xanh va bi do .Ban An nhan thay 1/9 so bi xanh bang 1/8 so bi do .hoi ban An co bao nhieu bi moi loai 

Hieu cua so be nhat co 4 chu so ti so cua 2 so la 1 phan 6 tim so lon