a cong 13 cong 54 cong 23 nhan 5 bang 678678
biet trung binh cong cua 3 so bang 58,82 neu tang so thu nhat len gap doi thi trung binh cong cua ba so bang 85,82 neu tang so thu hai gap len ba lan thi trung binh cong cua ba so bang 109,22 tim so thu ba
trung binh cong cua hai phan so bang 5/7.neu gap phan so thu nhat len 2 lan thi trung binh cong cua chung bang 3/4.tim phan so thu nhat?
1 .trung binh cong cua hai phan so la 5/12 .neu tang phan so thu nhat gap 2 lan thi trung binh cong cua chung bang 2/3 .tim hai phan so do .
2.trung binh cong cua ba phan so la 13 /36 .neu tang phan so thu nhat gap 2 lan thi trung binh cong cua chung bang 19/36 ,cho biet phan so thu hai lon hon phan so thu ba 1 /12. tim ba phan so do .
Biet trung binh cong cua ba so bang 58,82. Ney tang so thu nhat len gap doi thi trung binh cong cua ba so se bang85,82. Neu tang so thu hai len gap ba lan thi trung binh cong cua ba so se bang 109,22. timf so thu ba
Tong cua ba so bang 8 . Trung binh cong cua so thu nhat va so thu hai bang 2,75 . Trung binh cong cua so thu hai va so thu ba ba 2,75
trung binh cong 3 so la 5/8 . so thu 1 bang trung binh cong so thu hai va thu ba . so thu ba hon so thu 2 1/4 . tim 3 so duoi dang so thap phan ?
mot to cong nhan co so nu bang 1/3 so nam.sau theo cong viec nen da thay doi 3 cong nhan nam bang 3 cong nhan nu . vi vay so cong nhan nu bang 2/3 so nam . hoi co bao nhieu cong nhan
Mot doi cong nhan sua duong co 30 cong nhan nu va 75 cong nhan nam neu tang them 5 nu va chuyen di 5 nam thi luc nay so cong nhan ca doi bang bao nhieu % so cong nhan nu.
