有些题目如果按照一般的方法,顺着题目的要求一步步地列出算式求解,过程比较繁琐。这时,我们不妨倒过来想一想,也就是从最后的结果出发,运用加与减、乘与除之间的互逆关系,从后往前一步步地推算,这种思考问题的方法就叫做逆推法。下面我们通过几个例子说说如何运用逆推法解答一些比较复杂的竞赛题。 Some questions if in accordance with the general method, along the title of the requirements listed step by step formula to solve the process more complicated. At this moment, we may as well think about it from the last result, using the reciprocal relationship between addition and subtraction, multiplication and division, from the backward step by step. The way of thinking Reversed method. Here are some examples of how to use the inverse method to solve some of the more complex competition questions.