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《中学生数学》(初中版)2001年第3期P13刊登了李能助老师的文章《不等式证明一例》,笔者以为其中的证法三错误,为说明问题,现将题目及原文证法三(构造直角三角形)抄录如下：
“Middle school mathematics” (Junior middle school version) 2001 third issue P13 published the article “Inequalities to prove an example” of Li Nengzhuo. The author thinks that the three errors in the proofs are used to illustrate the problem. The construction of a right-angled triangle is reproduced as follows: