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配对巧证杨乐不等式714202陕西华阴黄河工程机械集团中学李建章的一种证法，受益非浅．现利用配对思想给出一种既简单又有趣的巧妙证法，供参考．证明设一道IMO题的简证401555重庆市合川太和中学袁安全题目设In是UABC中最小的内角，点B和C将这个三角形的外接圆分成两段弧．设U
Pairing skillful evidence Yang Le inequality 714202 Shaanxi Huayin Yellow River Engineering Machinery Group Middle School Li Jianzhang’s one kind of verification method, benefited greatly. Now using pairing ideas to give a simple and interesting ingenious proofs for reference. Proof of setting up an IMO question 401555 Chongqing Hechuan Taihe Middle School Yuan security topic Let In be the smallest internal angle in UABC, points B and C divide the circumcircle of this triangle into two arcs. Set U