Hiệu 2 số lúc đầu là:7890-123-456=7311
Đáp số:7311
7311 . Chắc chắn 1000000000000000000000000000000000000000000000000000%
7311 dung ko sai dau chac chan 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000% do nha