一、“色彩块”涂抹,培养“代换”思想代数的最基本思想是“代换”——字母代替数及字母代替代数式。“代换”的思想方法应在六年级基本形成,并在今后的学习中不断地体验和充实。为形成“代换”的基本思想,需考虑一系列问题:哪些可以“代换”?怎样“代换”?为什么要“代换”?“代换”后又怎么办等。我运用多媒体技术,把用以代换的字母及被代换的单元(数或式)用同一色彩块涂抹。 First, “color block ” painting, training “substitution ” The most basic idea of ​​algebra is “substitution ” - letters instead of numbers and letters instead of algebra. “Substitution ” method of thinking should be basically formed in the sixth grade, and continue to experience and enrich in the future study. In order to form the basic idea of ​​“substitution”, a series of questions need to be considered: which ones can be replaced by substitutions, substitutions, substitutions, substitutions, After how to do so. I use multimedia technology, the letters used to replace and replace the unit (number or type) with the same color block smear.