Tang, Minh Dung, and Nguyen Hoang Oanh Le. “ENHANCING MATHEMATICAL PROBLEM-SOLVING COMPETENCY OF NINTH-GRADE STUDENTS THROUGH STAIRCASE SLOPE ANALYSIS”. Ho Chi Minh City University of Education Journal of Science 23, no. 9 (September 30, 2026). Accessed October 10, 2026. https://journal.hcmue.edu.vn/index.php/hcmuejos/article/view/5481.