Abdullayeva Marifat Salimjom qizi, and Abdullayev Nozimjon Kadiraliyevich. “THEORETICAL AND PRACTICAL FEATURES OF WORKING ON PROBLEMS IN MATHEMATICS LESSONS”. International Engineering Journal For Research & Development, vol. 5, no. 5, Aug. 2020, p. 3, doi:10.17605/OSF.IO/6XQ4T.