tong 3 so la;579+1245+912=2736
so thu nhat va so thu 2 la;2736:2=1368
so thu nhat la;1368-1245=123
so thu 2 la;579-123=456
so thu 3 la;1245-456=789
dap so;123;456;789
tim 2 so co hieu bang 129 , biet rang neu lay so thu nhat cong voi so thu 2 roi cong voi tong cua chung bang 2010
tim hai so co hieu bang 129, biet rang neu lay so thu 1 cong voi so thu 2 roi cong voi tong cua chung thi duoc 2010
Tim hai so co hieu bang 108,biet rang neu lay so thu nhat cong voi so thu hai roi cong voi tong cua chung thi bang 2016
cho 3 so biet,trung binh cong cua so thu 1 va so thu 2 bang 1945,trung binh cong cua so thu 2 va so thu 3 bang 1954 trung binh cong cua so thu 1 va so thu 3la 1975.Tim so thu 2
tim hai so co hieu bang 248, biet rang neu lay so thu nhat cong voi so thu hai voi cua chung thi duoc 808
cho 4so co tbc la 32 neu so thu nhat cong voi 3 so thu hai tru di 3 so thu ba chia cho 3 so thu tu nhan voi 3 thi duoc 4 so bang nhau tim so nho nhat
tong 3 so bang 364 biet , neu nhan so thu nhat voi 2 , so thu 2 voi 3 va so thu 3 voi 4 ta duoc 3 ket qua bang nhau . tim so thu 1
tim 2 so co hieu bang 66 neu lay so thu1 cong voi so thu 2 cong voi tong cua 2 so thi bang 288
tong 3 so bang 364 biet neu nhan so thu 1 voi 2,so thu 2 voi 3,so thu 3 voi 4 thi dc 3 ket qua bang nhau.tim so thu nhat
