文[1]给出了2013年北京大学保送生考试数学试题的解析.在压轴题的处理上,作者通过巧妙设置四个参数,运用“算两次”思想,得到题解的关键步骤ad=bc,从而证明了结论.笔者在仔细演算之后,发现原文存在若干错误,不过“瑕不掩瑜”.本文中,笔者对原解中存在的错误以予修正,并在此基础上运用“类比归纳”思想,给出一个更为简洁的解答,如有不足之处,敬请指正.(2013年北京大学保送生考试数学科目最后一 Paper [1] gives an analysis of the Peking University Health exam questions in 2013. In the process of the finale problem, the author gets the key steps of solving the problem by setting four parameters ingeniously and applying “double counting” ideas = bc, which proves the conclusion.After careful calculation, the author found that there are some mistakes in the original text, but “In this case, Analogy inductive ”thought, give a more concise answer, if there are any deficiencies, please correct me. (2013 Peking University Paul giving birth examination mathematics subject last