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2015年10月,笔者参与一次八年级上册期中试卷的命制工作,其中关于压轴题的原创命制,经历了试题备选、细化打磨,优化定稿等过程,在此与大家分享。1试题备选本次命题包括全等三角形、轴对称图形、勾股定理三个章节的内容,结合命题基本要求和双向细目表,本卷前27题都已落实了重要考点。在确定压轴题考查的知识点和数学方法时,命题组成员建议以动态几何考查全等三角形、等腰三角形或者利用轴对称求线段和差的极值。笔者认为,这类试题原创不易,不易做到公平和公正,进而影响信度和效度。于是,笔者结合八年级学生的数学认知水平和阅
In October 2015, I participated in the eighth grade of the papers on the life of the papers, including the original finale of the fate of the title, gone through the test options, refinement and polishing, optimization and finalization process, to share with you. 1 test candidates The proposition, including congruent triangles, axisymmetric graphics, Pythagorean theorem three chapters, combined with the basic requirements and two-way list of propositions, the first 27 questions of this volume have been implemented an important test center. When determining the knowledge points and math methods for examining nibbling questions, members of the proposition group suggest using dynamic geometry to examine congruent triangles, isosceles triangles or axisymmetric extremums for line segments and differences. The author believes that such questions original difficult, not easy to be fair and impartial, thereby affecting the reliability and validity. As a result, the author combines eighth-graders mathematical knowledge and read