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数学世界丰富多彩,又充满着矛盾,渗透着辩证法,解题时不妨进行辩证思维,这样可给解题带来新的思路和方法. 一、顺向与逆向例1 求2-22-23-24-25-26-27-
The world of mathematics is colorful and full of contradictions. It infiltrates dialectics. When thinking about problems, it is possible to carry out dialectical thinking. This can bring new ideas and methods to solving problems. First, the forward and reverse examples 1 Seeking 2-22-23- 24-25-26-27-