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动态问题是中考试题中出现频率较高的题型,而动直线是其中比较重要的一类.这类题目的考察方式比较灵活,可作为选择题,也可作为填空题,还可以作为解答题.相对于动点问题而言难度又有所增大,学生在完成这类问题时不易理解.我对2014年的中考试题进行了深入研究,在教学实践中归纳总结,得到了解题的几种有效方法.一、找规律利用直线的变化情况,寻找变化规律得出变化周期从而解决问题.例1.在一次科技活动中,小明进行了模拟雷
The dynamic problem is the type of questions that appear frequently in the middle school entrance exam questions, and the moving straight line is one of the more important category.The study methods of such topics are more flexible, can be used as multiple choice questions, but also can be used as answer questions Compared with the problem of moving point, the degree of difficulty has also increased, students are not easy to understand in the completion of such problems.I conducted in-depth study of the 2014 mid-term exam questions in 2014, summed up in the teaching practice, get a few problems First, to find the law of the use of linear changes in the search for changes in the law to come to a change cycle in order to solve the problem.Example 1. In a scientific and technological activities, Xiao Ming simulated mines