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1试题呈现如图1,在等腰三角形ABC中,∠BAC=90°,AB=AC=2,点D是AC边上一动点,联结BD,以AD为直径的圆交BD于点E,则线段CE长度的最小值为____。2学生答题情况本题的预设难度系数为0.4,但是从3000份试卷的批阅情况看,错误率约为96%,,也就是说,从整体上看,学生解决问题的实际难度偏大,试题的区分功能不强。笔者对解题情况进行统计和分析,发现多数学生找不到问题的切入口。下面列举学生解题时存
1 questions presented in Figure 1, in the isosceles triangle ABC, ∠ BAC = 90 °, AB = AC = 2, point D is the AC edge of a moving point, the link BD to AD diameter of the circle BD at point E, Then the minimum length of line segment CE is ____. 2 The students answer the problem The default difficulty coefficient of 0.4, but from 3000 copies of the examination of the situation, the error rate of about 96%, that is to say, on the whole, students actually difficult to solve the problem, the test The distinction between function is not strong. The author of the problem solving statistics and analysis, found that most students can not find the problem cut entry. The following is a list of students solving problems