古人云:温故而知新。就是说学习知识还需要复习,通过复习我们不仅可以掌握学习过的知识,还能知道更多新的知识。让我们一起来复习吧!例1:看谁算得又对又快。25+16+45=69-27-33=思路点睛:这两道题是100以内连加、连减计算题,正常要按照从左到右的顺序计算,但仔细观察后我们发现有巧算的方法,如下图: The ancients said: so old and new. That is to say, learning knowledge still needs to be reviewed. By reviewing, we can not only learn learned knowledge but also know more new knowledge. Let’s review together! Example 1: See who considered it fast and right. 25 + 16 + 45 = 69-27-33 = Thinking Dot: These two questions are even less than 100 plus, even minus the calculation of the normal order to be calculated from left to right, but after careful observation we found a clever calculation The method, as shown below: