等量代换是指用一种量(或一种量的一部分)来代替和它相等的另一种量(或另一种量的一部分),它是数学中一种基本的思想方法,也是代数思想方法的基础。下面是人教版三年级下册数学广角“等量代换”的一个教学案例,它通过让学生对主题图的观察和分析,利用天平或跷跷板的原理,使学生在解决实际问题的过程中初步体会等量代换的思想方法,为以 Equivalent substitution refers to substituting another quantity (or a part of another quantity) equal to it by one quantity (or a quantity of one part), which is a basic thought method in mathematics and The Basis of Algebraic Thinking Methods. The following is the third edition of the PEP Edition mathematics wide angle “equivalent replacement ” a teaching case, which by allowing students to observe and analyze the theme of the map, the use of balance or seesaw principle, so that students in solving practical problems In the process of initial understanding of the same method of substitution, as