Duong Huu Tong, Le Thai Bao Thien Trung, Nguyen Phu Loc, Nguyen Hoang Xinh, Huynh Ngoc Toi


The monotonicity of a function plays an important role in the general mathematics curriculum in Vietnam, because it is considered as an effective tool for solving mathematical problems involved with the monotonic intervals of functions, their extreme, absolute maximum value and absolute minimum value. Normally, students commit errors in solving these problems because of their complexity and difficulty. In addition, specific characteristics of knowledge also make children make mistakes. The sample consisted of 362 students, and they had the task of identifying errors in false assumptions. From the results of the survey, it was found that when dealing with the monotonicity of the functions, students were still misled.


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monotonicity of a function, error, reason, mathematics education


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