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本文用一道课本习题,给出几个几何命题的别证。其中有些证明显得比其它证法巧妙而简洁。 1°本刊89年第12期《关于三角形的一个命题及其应用》一文,对下述
This article uses a textbook exercise and gives some evidence of geometrical propositions. Some of these proofs appear clever and concise than others. 1° of the 12th issue of the “About a proposition of the triangle and its application” in the 89th issue of the journal