Trung binh cong cua n so la 80,biet mot trong cac so do la 100.Neu bo so 100 thi trung binh cong cac so con lai la 78. Tim n ?
trung binh cong cua N la 80 biet 1 trong nhung so do la 100 . neu bo so 100 thi thi trung binh cong cua cac so con lai la 78 . tim N
trung binh cong cua ba so la 97 tim mot trong ba so do biet no la trung binh cong cua so con lai
tim so trung binh cong cua ba so la 100 tim so thu hai biet no bang trung binh cong cua hai so con lai
Trung binh cong cua 2 so la 28,biet mot trong 2 so do la 30. Tim so con lai ?
trung binh cong hai so la 13 biet neu xep them so thu ba nua 100 thi trung binh cong cua 3 so la 11 tim so thu ba
trung binh cong cua bon so la 14 biet trung binh cong cua ba so trong bon so la 15 tim so con lai
trung binh cong cua 3 so la 24 neu gap so thu nhat len 2 lan thi trung binh cong cua chung la 28.neu gap so thu 2 len 3 lan thi trung binh cong cua chung la 36 .tim 3 so do
trung binh cong cua ba so la 425, biet hai trong ba so do la 231,389.Tim so con lai