trung binh cong cua 3 so la 5/8 so thu ba bang trung binh cong cua so thu nhat va so thu hai so thu nhat hon so thu hai la 1/4 tim ba so do (viet dap so duoi dang so thap phan)

mot phep cong co ba so hang co tong  bang 2010 . So hang thu nhat gap doi so hang thu 2, so hang thu 3 bang hai lan tong so hang thu nhat va thu hai. Tim ba so hang cua phep cong tren

Cho mot phet cong cong co so hang thu nhat hon so hang thu hai la 15 don vi .Biet tong cua so hang thu nhat so hang thu hai va tong bang 682. Tim so hang thu hai cua tong 

Mot phep cong co hai so hang la so chan lien tiep .Tong cac so :so hang thu nhat so hang thu hai va tong bang 276.Tim phep cong do biet so hang thu nhat lon hon so hang thu hai 

Cho 3 so thap phan trong do tong cua so thu nhat va so thu hai la 4,6 tong cua so thu hai va so thu ba la 9 tong cua so thu nhat va so thu ba la 6,8 . Tim 3 so do.

so thu nhat va so thu hai co tong la 122.so thu ba bang 53 va do thu tu hon trung binh cong cua ca 4 so la 26.tim so thu tu. tra loi nhanh cho minh nha.

tim so co 3 chu so. Biet trung binh cong cua 3 chu so la 2 va chu so hang tram bang tong chu so hang chuc va hang don vi. Tim 3 chu so do ?

tim hai so thap phan co tong la 26,54 biet neu doi dau phay so thu nhat sang phai 2 hang ta duoc so moi va biet hieu cua so moi va so thu hai la 1118.8