Tim hai so co tong bang 61 . Biet rang gap 3 lan o so hang thu nhat va gap so hang thu hai len 5 lan thi duoc tong moi la 229.
Tim so hang thu nhat biet rang gap so hang thu nhat len 5 lan va giu nguyen so hang thu hai thi tong se them 1344 don vi?
tim so hamg thu 2 biet rang khi giu nguyen so hang thu 1 va gap so hang thu 2 len 4 lan thi tong tang them 2349 don vi
tong hai so la 64 biet so hang thu nhat la 12 so hang thu hai la 6 neu giam so hang thu nhat di 12 don vi so hang thu hai giam di 6 don vi tim tong moi
trong 1 phep cong gom 2 so hang, biet rang neu tang so hang thu nhat them 234 thi tong se bang 579. hoi neu gian so hang thu 2 di 234 thi tong se bang bao nhieu
tong 2 so gap 3 lan so hang thu nhat biet so hang thu hai la 48 hoi so hang thu nhat la bao nhieu
hieu cua hai so la 4104, biet neu bo so 0 o hang don vi cua so bi tru thi duoc so tru. tim hai so do
cho mot so co ba chu so ma chu so hang tram la 4. neu xoa bo chu so 4 nay di, ta duoc 1 so co hai chu so. Biet tong cu so co ba tru so da cho va so co hai chu so co duoc sau khi xao chu so 4 la 450. Tim ba chu so da cho ban dau
