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数学中的逆向思维就是要引导学生认识某些知识之间的可逆关系,形成可逆联想,采用“反过来”想一想的思维方法。在几何初步知识中,逆向题是大量的。我常采用顺逆并举的方法,对学生进行逆向思维训练。首先从顺向思维题开始,然后改变题目中的条件和问题,使其成为逆向思维题。例如:一个直圓锥,它的底面直径是6厘米,高为3厘米,求它的体积是多少?
Reverse thinking in mathematics is to guide students to understand the reversible relationship between certain knowledge, the formation of reversible association, using the “reverse” thinking method of thinking. In the initial geometric knowledge, the reverse problem is a lot of. I often use the method of Shun and anti-retrograde thinking of students. First of all, starting from the thought of forward thinking, and then change the conditions and problems in the subject, making it a reverse thinking. For example: A straight cone, its bottom diameter is 6 cm, height is 3 cm, what is the volume for it?