1“示错”无限好文献[1]针对一道期中试题进行深入研究。题目是:“已知α=π/6,若cos(α+β)=3/5,0<β<(5π)/6,求cosβ。”苗老师先给出学生在考试时所用的三种解法及统计结果,接着对得分率不高的原因进行详细分析,苗老师从“思维刻板化、类似知识干扰、整体意识薄弱”三个方面揭示了学生解题时的思维状态。笔者读后深受启发,非常认同苗老师的“示错”观点,只有 1 “show wrong ” unlimited good literature [1] for a mid-term examination of the item in-depth study. The topic is: “Known α = π / 6, if cos (α + β) = 3 / 5,0 <β <(5π) / 6, find cosβ.” “Miao teacher first given the students used in the exam , Then analyzes the reasons for the low scoring rate in detail. From the three aspects of ”stereotyped thinking, similar knowledge interference and weak overall awareness“, Teacher Miao reveals the students’ thinking state when solving problems . Inspired by the author after reading, very much agree with Miao teacher ”show the wrong " point of view, only