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在许多数学竞赛资料上,有许多几何不等式证明问题,其中三角形中有关角的不等式是一个重要的类型.例如:已知A、B、C是三角形中
On many mathematics competitions, there are many geometric inequalities to prove the problem, in which the triangle inequality is an important type. For example: Known A, B, and C are triangles.