12-13高二上·陕西西安·期末
1 . 在长方体
中,已知
,求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c0a0fb27db6953d4ebadf8a1d35c57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
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2 . 如图,已知正方体
的棱长为2,
分别是
的中点.
(1)求三棱锥
的体积;
(2)求异面直线EF与AB所成角的大小(结果用反三角函数值表示).
![](https://img.xkw.com/dksih/QBM/2012/1/28/1570701513695232/1570701519101952/STEM/aff446a02e3c4cca925e0c1389b658ee.png?resizew=119)
![](https://img.xkw.com/dksih/QBM/2012/1/28/1570701513695232/1570701519101952/STEM/bea0855191634bce8d69d39230233213.png?resizew=33)
![](https://img.xkw.com/dksih/QBM/2012/1/28/1570701513695232/1570701519101952/STEM/e40a6b50336246b9aeef6cfcd614b51b.png?resizew=57)
(1)求三棱锥
![](https://img.xkw.com/dksih/QBM/2012/1/28/1570701513695232/1570701519101952/STEM/7c97ff49725c47019ce65b41f2e1623a.png?resizew=65)
(2)求异面直线EF与AB所成角的大小(结果用反三角函数值表示).
![](https://img.xkw.com/dksih/QBM/2012/1/28/1570701513695232/1570701519101952/STEM/fad9d336c4254709aa04e1922272da6c.png?resizew=208)
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12-13高一上·山东济宁·期末
3 . 设平面α∥β,如图所示,两条异面直线AC和BD分别在平面α、β内,线段AB、CD中点分别为M、N,设MN=a,线段AC=BD=2a,求异面直线AC和BD所成的角.
![](https://img.xkw.com/dksih/QBM/2012/1/26/1570695819943936/1570695825391616/STEM/88f0b531c6234103939ebcdd7cef7370.png?resizew=158)
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2011高三·河北·专题练习
4 . 如右图所示,已知四边形
为直角梯形,
,
,
平面
,且
,
.
![](https://img.xkw.com/dksih/QBM/2011/5/27/1570225577336832/1570225582669824/STEM/a0ea4cadace5473eba090f8c24126e9e.png?resizew=182)
(1)求
的长;
(2)求异面直线
与
所成角的余弦值的大小
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0facf189b2a3153beb7b9e077d3b1146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff5dc6b6eb86e699bbbec49a71d7691a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d2232ade76209e1109f3402d905f12d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://img.xkw.com/dksih/QBM/2011/5/27/1570225577336832/1570225582669824/STEM/a0ea4cadace5473eba090f8c24126e9e.png?resizew=182)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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11-12高二上·海南·期末
5 . 如图,正方形
与等腰直角△ACB所在的平面互相垂直,且AC=BC=2,
, F、G分别是线段AE、BC的中点.求
与
所成的角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe21ae075d3cc8e51cecec73747011d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://img.xkw.com/dksih/QBM/2011/4/26/1570130142838784/1570130148114432/STEM/910934eb818343b6914e06bff195e728.png)
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真题
6 . 已知正方体
的棱长为a.
(1)用平面
截去一角后,求剩余部分的体积;
(2)求
和
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
(1)用平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
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