Hai so co tong bang 2009 va hieu la 163 tim 2 so
tim cac so co hai chu so,biet rang moi chu so co tich hai chu so bang 18 va tong hai chu so bang 9
tim hieu cua so lon nhat co 3 chu so co tong cac chu so la 17 va so be nhat co 3 chu so co tong cac chu so bang 17
tim 2 so biet tong cua chung bang 9 va tich cua hai chu so gap doi tong?
tim mot so co hai chu so,biet rang tich cua hai chu so bang 20 va trong do co mot chu so la 6
Trong 1 phep chia co so chia la 8,thuong bang 24 va so du la 7.Tim so bi chia
Tim hai so co tong bang 61 . Biet rang gap 3 lan o so hang thu nhat va gap so hang thu hai len 5 lan thi duoc tong moi la 229.
a)Tim hai so tu nhien biet tong cua chung bang 2009 va biet giua chung co tat ca 20 so tu nhien khac
b)Tim hai so tu nhien biet tong cua chung bang 828 va biet giua chung co tat ca 15 so tu nhien khac
c)Tim hai so tu nhien biet tong cua chung bang 636 va biet giua chung co tat ca 11 so tu nhien khac
tim hieu , tich , thuong cua 2 so biet tong 2 so do la 15 va tong gap 3 lan so lon
