Từ Khoá: cho-luc-giac-deu-abcdef-co-tam-o-cac-menh-de-sau-dung-hay-sai-a-vector-ab-cung-phuong-voi-vector-mn-b-co-6-vector-khac-vector-khong-va-cung-phuong-voi-ab-co-diem-dau-diem-cuoi-lay-tu-cac-diem-da-cho-c