tim so co 3 chu so,biet rang khi viet them chu so 1 vao ben trai so do thi duoc so co 4 chu so gap 9 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.
tìm số có 4 chu so biet rang khi viet so 5 vao ben phai ta duoc so lon gap 5 lan so vua nhan duoc khi ta viet them chu so mot vao ben trai so phai 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
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 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
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 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
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