不错,这是几何解法,能得满分,辅助线是精华。。。如果用计算器,依余弦定理5分钟内肯定能算出答案,你这方法画对了辅助线才能更快 Template




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tomski不错,这是几何解法,能得满分,辅助线是精华。。。如果用计算器,依余弦定理5分钟内肯定能算出答案,你这方法画对了辅助线才能更快 coloring