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笔者参加了2013年上海市中考数学第23题的网上阅卷工作,本题是一道证明题,目的是考查学生的空间概念和逻辑推理能力.主要考查了:平行线的性质、三角形内角和、全等三角形的判定和性质、直角三角形的性质、平行线分线段成比例等知识.从全市的统计结果来看:第(1)小题的难度系数为0.89,平均分5.32(满分6分);第(2)小题的难度系数为0.65,平均分3.90(满分6分)[1].本文就考生
The writer participated in the online examination of the 23rd question of the 2013 Shanghai Senior High School Mathematics Examination. This question is a proving question. The purpose is to examine the student’s spatial concept and logical reasoning ability. The main examinations are: the nature of the parallel lines, the internal angles of the triangles, and the equality. The judgment and nature of triangles, the nature of right triangles, and the proportion of parallel line segments are proportional to knowledge. From the statistical results of the city, the difficulty coefficient of the first (1) topic is 0.89, and the average score is 5.32 (out of 6 points); (2) The degree of difficulty of the small item is 0.65, and the average score is 3.90 (out of 6 points) [1].