盲目的解题往往会使我们陷入题海,很难自拔,因而在解一道试题时,并不是只满足于题目解出来了,更重要的是解题后的反思,要尝试从不同的视角分析试题,真正做到解一道题,通一类问题,让解题变得高效.笔者就以下一道试题谈谈一些反思认识,揭示条件本质,以飨读者. Blind problem solving often makes us into the sea, it is difficult to extricate themselves, so in the solution of a test question, not only satisfied with the solution to the problem, more importantly, the problem-solving reflection, try to analyze from a different perspective Questions, truly solve a problem, pass a class of questions, so that problem-solving become efficient. The author on the following questions to talk about some reflection, reveal the nature of the conditions, in order to readers.