论文部分内容阅读
1978年,陕西省中学数学竞赛决赛题的附加题是: P为锐角△ABC内使∠APB=∠BPC=∠CPA=120°的点,M为△ABC内任一一点,则 MA+MB+MC≥PA+PB+PC
In 1978, the additional questions for the Shaanxi Provincial Middle School Mathematics Contest Final Title were: P is the point where the acute angle ΔABC is such that APB=∠BPC=∠CPA=120°, and M is any point within △ABC, then MA+MB +MC≥PA+PB+PC