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# 数学作业 - PowerPoint PPT Presentation

A 1. D 1. N. C 1. B 1. M. A. D. A. C. 数学作业. 1 、 如图所示，在长方体 ABCD-A 1 B 1 C 1 D 1 中 ,AB=5,AD=8,AA1=4, M 为 B 1 C 1 上一点且 B 1 M=2 ，点 N 在线段 A 1 D 上， A 1 D⊥AN. （ 1 ）求 cos< >; （ 2 ）求直线 AD 与平面 ANM 所成角的余弦值； （ 3 ）求平面 ANM 与平面 ABCD 夹角的余弦值。. O 1. C 1. A 1. B 1. O. D.

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## PowerPoint Slideshow about ' 数学作业' - kishi

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### 数学作业

M为B1C1上一点且B1M=2，点N在线段A1D上，A1D⊥AN.

（1）求cos< >;

（3）求平面ANM与平面ABCD夹角的余弦值。

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• 2、在长方体OABC-O1A1B1C1中，OA=2，AB=3，AA1=2，E是BC的中点。

• （1）求直线AO1与B1E所成角的余弦值；

• （2）作O1D⊥AC于D，求点O与点D的距离。

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