(799999999999999999999999999999999999999999 . 899999999999999999999999999999999999999999999 . 357478 . 24672467286 . 4787298461365863536 - 1 +9999999999998888888 -272457248579287691 . 164555 : 472869 . 9938787568 . 6238279 .42758899989998 - 32958719 + 1988578165916987858728865115551) . 0 Bài này khó quá ko bt ai làm đc ko nhỉ? ( Ko dành cho những thanh niên nghiêm túc ^-^)