全国各省市中考物理试卷上的压轴题,大多是综合计算题.这类题目考查的知识层次和能力要求都较高,因而是得分率较低的题目.认真分析试卷容易发现,不少同学常因无法建立解题方程而失误;也有同学由于建立的解题方程十分繁杂使解析中途受阻…….其实,这都是他们没有把握好建立解题方程的方法和优选技巧的缘故. The finale questions on the physical examination papers of the provinces and cities across the country are mostly comprehensive calculation questions. The knowledge level and ability requirements for such topics are high, so they are low scoring questions. Careful analysis of the test paper is easy to find, many students often Errors due to the inability to build problem solving equations; some classmates have been prevented by the complexity of the problem-solving equations established in the middle of the analysis. In fact, this is because they did not have a good grasp of the methods and optimization techniques for solving problem solving equations.