第 5计　趁火打劫《孙子·始计篇》 :“乱而取之” .唐朝诗人杜牧解释道 :“敌有昏乱 ,可以乘而取之” .就是说 ,当敌方遇到麻烦或危难时 ,就要乘此机会进兵出击 ,制服对手 .对数学的错题或错解 ,作认真细致的剖析可澄清模糊概念 ,掌握正确的解题方法 .上海一名高考状元 ,自己 The 5th plan to rob the “grandson of the grandson”: “Look out for chaos”. The Tang Dynasty poet Du Mu explains: “The enemy has a dilemma and can take it.” That is, when the enemy encounters trouble or distress , we must take this opportunity to enter the army to attack and subdue the opponent. To make a detailed analysis of the wrong or wrong solution of mathematics can clarify the vague concepts and master the correct method of solving the problem. A Shanghai college entrance examination scholar, himself