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题 设x≥0,求证: 王敬庚先生在本刊1993年第11期上介绍了此题的一种巧妙(但并不容易)的解析几何解法,不易想到,下面,我们给出它的一种简单的代数解法:
The title is set to x ≥ 0, to verify: Mr. Wang Jinggen introduced a clever (but not easy) analytical geometry solution to this question in the 11th issue of the Journal in 1993. It is difficult to think of it. Below, we give it a Simple algebraic solution: