类比推理是推理这部分内容的重点和难点.要从一个已知的命题出发类比得到一个新的命题,怎样类比,从什么角度类比,不少同学心中没底.本文介绍类比推理常用的几种策略,供大家参考.一、从对应元素入手例1如图1,在△ABC中,AB⊥AC,若AD⊥BC,则AB~2=BD·BC.类比该命题,如图2,在三棱锥A-BCD中,AD⊥面ABC,若A点在 Analogical reasoning is the key and difficult point to reason about this part of content.To start from a known proposition analogy to get a new proposition, analogy, analogy from what point, many students do not know the bottom of the heart.This article describes several commonly used analogical reasoning Strategy, for your reference. First, from the corresponding elements to start a case as shown in Figure 1, △ ABC, AB ⊥ AC, if AD ⊥ BC, AB ~ 2 = BD · BC. Analogy the proposition, Triangular pyramid A-BCD, AD ⊥ ABC, if the point A in