中考、高考、物理竞赛的压轴题一般多是比较复杂的计算题.在解这些题时,有些学生往往感到没有头绪,难以入手.究其原因,一是没有审清题意,审明条件;二是不能揭示出解题的关键,找不到解题突破口;三是没掌握解这类题的规律,找不到解题方法,因而形不成解题思路,只能“望题兴叹”.还有些学生即 In the examinations, college entrance examinations, and physics competitions, the final questions are usually more complicated. When solving these questions, some students often feel that they have no clues and are difficult to get started. The reasons are as follows. Second, it is impossible to reveal the key to solving the problem and find no solution to the problem. Third, there is no way to understand the laws of solving such problems, and no solution to the problem can be found. Therefore, the solution cannot be solved. ". Still some students are