近年来,高考物理试题趋向着重考查学生分析问题、解决问题的能力,会从题目中提取有用的信息,能找到临界状态、辅助条件等.辅助条件在题目中起到桥梁的作用,比如合速度与分速度问题.同学们在解这类问题时常常容易出错或找不到头绪.下面就四种不同的类型,讲解怎样巧妙运用合速度 In recent years, college entrance examination physics test questions tend to focus on the students’ ability to analyze problems and solve problems, extract useful information from the topics, and find critical conditions, auxiliary conditions, etc. Auxiliary conditions play a role in bridges, such as combining speeds. With sub-speed problems, students are often prone to errors or clues when solving such problems. Here are four different types of how to use smart speeds.