三棱锥及其侧视图、俯视图如图所示设,分别为线段,的中点,为线段上的点,且(1)证明:为线段的中点;(2)求二面角的余弦值 – 新东方在线�络课堂 Template


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tomski三棱锥及其侧视图、俯视图如图所示设,分别为线段,的中点,为线段上的点,且(1)证明:为线段的中点;(2)求二面角的余弦值 – 新东方在线�络课堂 coloring