同样一套试卷，学生做完需100分钟，且还有些题没有把握，而老师来做却只要20分钟左右，即快又准，原因何在？解题经验问题．其实，许多题在解完后，稍稍加以总结，便可得出规律，成为经验．以后再碰到类似题便可直接得出结论，这是快的原因，而且不会因计算中的笔误而导致错误 The same set of papers, students need 100 minutes to complete, and some questions are not sure, and teachers do it in as little as 20 minutes, that is fast and accurate, why not? Problem solving experience problem. In fact, after many questions are summarised after the solution is completed, they can be drawn and become experience. When you come across a similar question later, you can directly come to a conclusion. This is the reason for the quickness, and it won’t cause errors due to mistakes in calculations.