ชูศักดิ์ พ, กองทิพย์ ญ. A STUDY OF MATHEMATICAL PROBLEM-SOLVING ABILITY IN INEQUALITY FOR MATHAYOMSUKSA III STUDENTS VIA PROBLEM POSING ACTIVITIES. J. IND. EDUC. [Internet]. 2018 Aug. 31 [cited 2024 Apr. 20];17(2):75-82. Available from: https://ph01.tci-thaijo.org/index.php/JIE/article/view/123859