là gì? ........................
đấy là toaasn nâng cao
là gì? ........................
đấy là toaasn nâng cao
tim so thu nhat biet neu them chu so 3 vao ben trai so thu nhat ta duoc so thu hai gap 7 lan so thu nhat(biet so thu hai co hai chu so)
tim 2 so co tong=454 biet rang neu viet them chu so 4 vao ben trai so thu 2 thi duoc so thu 1
trung binh cong cua 3 so la 148 . biet rang neu viet them so chu so 0 vao ben phai so thu nhat thi duoc so thu 2 .viet them so 3 vao ben phai so thu nhat thi duoc so thu 3.tim trung binh cong so thu 1 va so 3
tim 1 so co 2 chu so biet rang neu viet them vao ben trai ben phai so do 1 chu so 5 ta duoc 1 so moi co 4 chu so gap 75 lan so phai tim
tim so co ba chu so biet rang neu viet them chu so 1 vao ben phai so do thi ta duoc mot so gap 3 lan so co duoc bang cach viet them chu so 2 vao ben trai so do
Trung binh cong cua 3 so la 85. Neu them 1 chu so 0 vao ben phai so thu hai thi duoc so thu nhat, neu gap 4 lan so thu hai thi duoc so thu ba. Tim 3 so do.
Tim mot so co 2 chu so biet rang neu them chyu so 1 vao ben trai ta duoc 1 so gap 3 lan so da cho
Tim 1 so co 2 chu so , biet rang neu iet them chu so 6 vao ben trai so do ta duoc so moi gap 9 lan so ban dau.
tim 2 so biet trung binh cong cua 2 so bang 245 neu them so 4 vao ben trai cua so thu nhat thi duoc so thu 2
tim so thu nhat va so thu hai