通解估计比较难，必须先确定AO, BO, CO能否构成三角形，如果能，再求角度，可考虑用解析几何和三角函数，比较繁琐

来源: 万斤油于 2022-06-01 07:30:28 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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