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.

Tong cua 4 so tu nhien la so lon nhat co hai chu so .Neu xoa di chu so o hang don vi cua so thu nhat thi duoc so thu hai .So thu ba = hieu cua so thu nhat va so thu hai .So thu nhat la tich cua so be nhat co ba chu so va so co bon chu so .Tim so thu tu .
 

tim so co hai chu so ,biet tong cua hai chu so la chan lon nhat co mot chu so va hieu cua hai chuso do la 3

hai so co tong bang so lon nhat co hai chu so so va hieu bang tich 2 chu so cua so lon nhat co hai chu so do hai so do la

hieu cua hai so la so lon nhat co sau chu so ti so cua hai so la so be nhat co hai chu so tim hai so

tinh hieu cua so lon nhat co 6 chu so khac nhau va be nhat co 6 chu khac nhau

viet so be nhat co 6 chu so hang nghin la 8 chu so hang chuc la 5

hieu cua hai so lon nhat co 5 so chan ti so cua hai so la so lon nhat co mot chu so tim hai  so do

Tim 2 so biet tong cua chung la so lon nhat co 4 chu so khac nhau va hieu la so be nhat co 4 chu so

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.