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本文介绍三边成等比数列的如下15个命题,并给出证明. 定理1△ABC三边a、b、c成等比数列的充要条件是;
This paper introduces the following 15 propositions of the three-sided sequence of equal ratios and gives the proof. Theorem 1: The necessary and sufficient conditions for the equivalence sequence of three sides of △ABC are: