tim so co 3 chu so,biet rang khi viet them chu so 1 vo ben trai so do thi duoc so co 4 chu so gap 9 lan so phai tim
biet bai nao giai ho bai y
1tim mot so co 2 chu so biet rang so do gap 5 lan tong chu cac so cua no
tim so co 3 chu chu so biet rang them chu so 5 vao ben phai so do thi so do tang them 1112dv
tim mot so tu nhien co 2 chu so biet rang them chu so 9 vao ben trai so do thi duoc mot so gap 13 lan so da cho
tim so co 4 chu so ,biet neu viet them chu so 5 vao ban phai so do thi co gia tri gap 5 lanso nhan duoc sau khi viet them chu so 1 vao ben trai so phai tim
tim 1 so tu nhien co 3 chu so biet rang khi viet them chu so 9 vao ben trai so do ta duoc 1 so gap 26 lan so can tim
tim mot so co hai chu so, biet rang khi viet them so 4 vao ben trai so do , ta duoc mot so gap chin lan so phai tim
Tìm so co hai chu so biet rang neu ta viet them chu so 2 vao ben trai va ben phai so do ta duoc so moi gap 36 lan so phai tim.
tim mot so tu nhien co 5 chu so biet rang khi viet them chu so 6 vao ben trai so do thi duoc so moi gap 9 lan
Tim so co 3 chu so,biet rang khi viet them chu so 2 vao ben trai so do thi so do se tang gap 9 lan.
tim so co 2 chu so biet rang khi viet them chu so 2 vao ben trai so do thi duoc so moi gap 6 lan so cu