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关于杠杆如何转动的问题,在解答时往往易出差错。有些参考书介绍的“虚设法”、“极端法”等特殊解法,由于思路多变,不易被学生熟练掌握,所以学生对这类题的分析仍感困难,本文就如何分析、判断这类问题作一介绍。
The question of how levers rotate is often error-prone. Some special books such as “virtual management” and “extreme law” introduced by some reference books are difficult to be mastered by students due to their changeable thinking. Therefore, it is still difficult for students to analyze such questions. This article will analyze and determine such issues. Make an introduction.