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2015年参加重庆市2015年初中毕业暨高中招生考试数学试题(B卷)阅卷工作,在阅卷过程中,发现学生在解答24题过程中,得分率偏低,特别在对第二问的解答过程中,学生不能理解题意,未能构建出相应的几何模型,造成了严重的解题障碍.现把现场阅卷中收集的典型错误和正确解法归纳如下.原题:(2015·重庆)某水库大坝的横截面是如图1所示的四边形ABCD,其中AB∥CD.瞭望台PC正前方
In 2015, he participated in marking the graduation cum high school entrance exam math test (B) of Chongqing Municipality in 2015. During the marking process, he found that when students answered 24 questions, the scoring rate was low, especially in the process of answering the second question , The students can not comprehend the questions and can not construct the corresponding geometric model, which has caused serious obstacles in solving the problems.Currently, the typical mistakes and correct solutions collected in the on-site marking are summarized as follows. The cross section of the dam is a quadrilateral ABCD as shown in Figure 1, where AB // CD.