tim mot so biet rang neu viet them mot chu so 0 vao ben phai ta duoc mot so lon hon so cu la 162 don vi ?
tim 1 so tu nhien , biet rang neu viet them 1 chu so 3 vao ben phai so do thi so do tang them 279 donvi
tim mot so biet rang khi viet them chu so 6 vao ben phai so do ta duoc so moi hon so cu la 2562 don vi
tim mot so co 2 chu so biet rang khi viet them chu sô 3 vao ben trai so do thi dươc so moi gap 7 lan so phai tim
viet them chu so 3 vao ben phai mot so ta duoc so moi hon so phai tim 273 don vi tim so do
lam on viet ca loi giai
tim so co bon chu so;biet rang khi viet them chu so 2 vao ben phai so do thi duoc so moi co nam chu so hon so phai tim 11306 don vi
tim mot so co bon chu so biet rang khi viet them chu so 3 vao ben trai so do thi duoc so moi gap 9 lan so phai tim
tong cua hai so la 281.Neu viet them mot chu so vao ben phai so be thi duoc so lon .tim hai so do
tim mot so co 4 chu so biet rang khi viet them chu so 3 vao ben trai so do thi duoc so moi gap 7 lan so phai tim