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 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 mot so tu nhien co hai chu so biet rang neu viet them mot chu so 2 vao ben trai va mot chu so hai vao ben phai so do thi ta duoc mot so lon gap 153 so ban dau

tim mot so tu nhien co 2 chu so biet rang neu them chu so 0 vao ben phai va 1 chu so 1 vao ben trai so do thi ta duoc so moi la 50 so do la

tim mot so tu nhien co hai chu so biet neu viet them mot chu so 0 vao ben phai va mot chu so 1 vao ben trai so do thi ta duoc so moi bang 50 la so phai tim

tim 1 so co 4 chu so , biet rang neu them chu so 1 vao ben trai so do ta duoc so moi gap 6 lan so phai tim . luy y bai giai

Tim mot so co hai chu so biet rang neu viet them cung luc cs 1 vao ben phai va ben trai so do ta dc so moi gap 23 lan so da cho.

mot so tu nhien co 5 chu so. biet rang viet them 1 vao ben phai va them chu so1 vao ben trai thi ta duoc so moi lon gap 3 lan so ban dau. tim so ban dau

tim mot so co hai chu so biet rang neu viet them chu so 3 vao ben trai so do ta duoc so moi [co 3 chu so } = 5 lan so phai tim