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我们给出如下引理一个较[1]为简单的证明. 引理设两个三角形有一边相等,另两边之和相等,那么另两边之差小的三角形面积较大. 证明设相等的边为α,另两边分别为x
We give the following lemma a simpler proof than [1]. Lemma is based on the fact that two triangles have one side equal and the other two edges are equal, then the other two sides have a small area with a small difference. Prove that the equal sides are α, the other two are x