tong cua 2 so la 120 biet so be bang 1/2 so lon.Tim 2 so do
Tong cua hai so la 19.So be bang 2 phan 3 so lon.Tim hai so do
tim 2 so , biet tong hai so do bang 788 va so lon chia cho so be thi duoc thuong la 11 du 32
tim 1 phan so co tong va tu so cua phan so do la 120 va biet neu chuyen 13 don vi tu mau so len tu so ta duoc phan so moi co gia tri bang 1
cho hai so biet so be bang 40% tong 2 so hoi so be bang may phan tram so lon
tong hai phan so la 5/7 neu bot phan so be di mot nua thi phan so lon gap 4 lan phan so be tim phan so do
hieu hai so bang 1/3 so be. Tong hai so la 63. Vay so be la
co bao nhieu phan so be hon 1 ma tich tu so va mau so bang 120
Tong hai so thap phan bang 95,28.Neu tang so be len 3 lan,so lon len 2 lan thi duoc hai so co tong bang 199,16.Tim hai so do.