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今天,我们复习了有关完全平方公式的知识,老师在课堂上详细地讲解了公式的结构及如何运用公式进行计算.我感觉自己对这部分知识掌握得非常好.课下我和曹吉康进行比赛,选择同样的10道题,看谁算得又对又快.我以为自己一定会比他算得快.可是,在我刚刚算到第四道题的时候,他已经把10道题都算完了,而且都是正确的.“你为什么速度这么快,而且这么准?”他向我传授了秘诀:“我为了便于记忆,根据完全平方公式的结构,自己总结出如下口诀:二数和或差平方,展开式它
Today, we reviewed the knowledge about the complete square formula, and the teacher explained in detail the structure of the formula and how to use the formula to calculate it. I feel I have a very good grasp of this part of the knowledge. , Choose the same 10 questions, to see who is considered right and fast again, I thought I would be faster than him, but when I just count the fourth question, he had finished the 10 questions, And are all right. ”Why are you so fast, and so accurate?“ He taught me the secret: ”In order to facilitate the memory, according to the structure of the complete square formula, he summed up the following formulas: Or squared, expand it