tim mot so co hai chu so biet rang neu viet them vao giua so do mot so co hai chu so kem so phai tim 1 don vi thi duoc mot so moi gap 91 laan so phai tim tim hai so
tim so co 2 chu so biet rang neu ta viet them vao giua so do 1 so co 2 chu so kem so phai tim mot don vi thi so moi gap 91 lan so phai tim
tim 1 so co 2 chu so biret rang neu viet xen vao giua so do 1 so co 2 chu so ken so phai tim 1 don vi ta duoc do gap 9 lan so phai tim
Tim môt sô co 4 chu so biet rang neu viet them chu so 6 vao ben phai so do thi duoc so moi lon hon so phai tim 1 7 6 1 don vi
tim 1 so co 2 chu so biet rang neu viet them chu so 0 vao giua hang chuc va hang don vi ta duoc 1 so moi gap 6 lan so phai tim
tim so co hai chu so biet rang neu viet them chu so 1 vao giua 2 chu so thi ta duoc so moi gap 9 lan so phai tim
tim so co hai chu so biet rang neu ta viet them chu so 1 vao giua hai chu so cua so do ta duoc so moi gap 9 lan so phai tim
tim so co 2 chu so biet rang neu ta viet them chu so 1 vao giua 2 chu so cua so do ta duoc so moi gap 9 lan so phai tim
tim so co hai chu so biet rang neu ta viet them chu so 1 vao giua 2 chu so cua so do ta duoc so moi gap 9 lan so phai tim