lam cho tat ca moi nguoi deu phai hoc tot toan ly hoa cac ban hay dang cac bai toan hay va kho len day va thu tai cua minh de gjai nhung bai toan cuc kho do cac thanh vien trong nhom dat ra
nhung bai toan do can phai dung tuong doi khong dc de wa hay kho wa neu kho wa thi cung co the dang len can phai co loi giai sau moi bai toan