【评析:“数学广角”是三年级下册109页的内容,是一节等量代换思想的数学课,也是一节比较抽象的思维训练拓展课,它是基于一般思维习题之上的教学,所以教起来比一般的例题要难一些。本文就是这一内容的教学案例及评析,供读者阅读和研究。】一、激趣导入,构建新知平台师:同学们,? 【Comment: “Mathematics Wide Angle” is the 109th volume of the third grade under the volume of the book, is a mathematical equivalent of the idea of ​​equivalent replacement, but also a more abstract thinking training to expand the class, it is based on the general thinking exercises on the teaching , So it is harder to teach than the usual examples. This article is the teaching case and evaluation of this content for readers to read and study. 】 One, exciting import, build platform for new knowledge: students,?