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李新荣同学在本刊2003年第2期中对下面这道题提供了三种证法,受其启发,在老师的指导下,我还找到了一个更为简单的构造性证明请看:
In the second issue of 2003, Li Xinrong provided three kinds of proofs for the following question. Inspired by it, under the guidance of the teacher, I also found a simpler constructive proof. Please see: