有些数学竞赛题,数字繁杂,计算困难,真是“山重水复”,但当你仔细观察、分析、计算,发现某种关系时,便觉得“柳暗花明”了.这类问题,对于培养我们的观察分析能力,启发我们的思维很有好处.下面举例说明. Some math contest questions, with complicated numbers and difficult calculations, are really “heavy and complex,” but when you carefully observe, analyze, calculate, and find a certain relationship, they feel that “there is a dark shadow.” These kinds of questions are for training our observations. Analytical ability, inspired our thinking is very good. Here is an example.