(如图)已知正方体
的棱长均为1,
为棱
上的点,
为棱
的中点,异面直线
与
所成角的大小为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195e727f61cfb2a416f183090233360e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1428aea6b1d90708ab040597f5f3db37.png)
![](https://img.xkw.com/dksih/QBM/2010/4/30/1569711188901888/1569711194161152/STEM/1023f1886b5a414386f2b9c7bce297e5.png?resizew=147)
2010·上海徐汇·二模 查看更多[3]
(已下线)2010年上海市徐汇区高三第二次模拟考试数学卷(理)(已下线)上海市徐汇区2009-2010学年第二学期高三年级学习能力诊断卷数学(理科试卷)(已下线)2010年云南省第二次高中毕业生复习统一检测
更新时间:2019-01-30 18:14:09
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相似题推荐
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图所示,直三棱柱
中,
,
,棱
.
、
分别是
、
的中点.
![](https://img.xkw.com/dksih/QBM/2021/12/24/2879411643064320/2881600186081280/STEM/41358081be06476387bae8c71cdfe993.png?resizew=263)
(1)求证:
;
(2)求直线
与直线
所成夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca38004c7744a7567bef30f0674fe60f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3cc9cccfb4c260dac05f4ed57e8c10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a696a182fff038a86b2bbe8ca099442.png)
![](https://img.xkw.com/dksih/QBM/2021/12/24/2879411643064320/2881600186081280/STEM/41358081be06476387bae8c71cdfe993.png?resizew=263)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9cbc57692d07ce82a436d5f76758f6.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd4c85bb98a2a0afddd7ed92578ad2e.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】如图所示,在长方体
中,
,M为
上一点且
,点N在线段
上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/8f1a25f6-13d2-4404-bfcf-6f56387afd9a.png?resizew=173)
(1)求
;
(2)求直线AD与平面ANM所成角的正弦值;
(3)求平面ANM与平面ABCD所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d97deabaa2ea1c57950004f2ac8f9aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4035b93e4af5689714755a7e859792.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31a7ebdc67d71c6d08737669d5a215d8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/8f1a25f6-13d2-4404-bfcf-6f56387afd9a.png?resizew=173)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7638b7d7098bac6efd19eb7fb0e5866.png)
(2)求直线AD与平面ANM所成角的正弦值;
(3)求平面ANM与平面ABCD所成锐二面角的余弦值.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图1,四棱锥
中,
底面
,面
是直角梯形,
为侧棱
上一点.该四棱锥的俯视图和侧(左)视图如图2所示.
(1)证明:
平面
;
(2)线段
上是否存在点
,使
与
所成角的余弦值为
?若存在,找到所有符合要求的点
,并求
的长;若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/2013/6/25/1571254407020544/1571254412394496/STEM/d95437f410ba4ddd8324833ee45d9938.png?resizew=75)
![](https://img.xkw.com/dksih/QBM/2013/6/25/1571254407020544/1571254412394496/STEM/3ea377ca1df24932bfdc5bfd74acc708.png?resizew=41)
![](https://img.xkw.com/dksih/QBM/2013/6/25/1571254407020544/1571254412394496/STEM/85501d77ab0443e6bbe0f1dbc5cf138f.png?resizew=48)
![](https://img.xkw.com/dksih/QBM/2013/6/25/1571254407020544/1571254412394496/STEM/85501d77ab0443e6bbe0f1dbc5cf138f.png?resizew=48)
![](https://img.xkw.com/dksih/QBM/2013/6/25/1571254407020544/1571254412394496/STEM/bd43dd8110c64b868c7cc238293c87fc.png?resizew=21)
![](https://img.xkw.com/dksih/QBM/2013/6/25/1571254407020544/1571254412394496/STEM/c6c6bbef52234be3bf1caba7f399b1c8.png?resizew=27)
(1)证明:
![](https://img.xkw.com/dksih/QBM/2013/6/25/1571254407020544/1571254412394496/STEM/3370736128e545aab0e0dae2a6317609.png?resizew=41)
![](https://img.xkw.com/dksih/QBM/2013/6/25/1571254407020544/1571254412394496/STEM/ff820f04abf34a7db21271b30a5d36f5.png?resizew=37)
(2)线段
![](https://img.xkw.com/dksih/QBM/2013/6/25/1571254407020544/1571254412394496/STEM/09a8baa79cec45b8875750b284bbf133.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2013/6/25/1571254407020544/1571254412394496/STEM/88ddc02e37824c369338ebaa2a4470b7.png?resizew=19)
![](https://img.xkw.com/dksih/QBM/2013/6/25/1571254407020544/1571254412394496/STEM/284932a4db0141ec8c7404eb6dddb8b7.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2013/6/25/1571254407020544/1571254412394496/STEM/4b4fcd17ddf14601a76d62e65b9821a9.png?resizew=28)
![](https://img.xkw.com/dksih/QBM/2013/6/25/1571254407020544/1571254412394496/STEM/fc549f64324345b4aa1c2ef85b7e4cb5.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2013/6/25/1571254407020544/1571254412394496/STEM/88ddc02e37824c369338ebaa2a4470b7.png?resizew=19)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/13/92f9866b-edb7-4b0e-863e-ff698a53260f.png?resizew=436)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】如图,在四棱锥
中,底面ABCD为正方形,平面
平面ABCD,
,
.
![](https://img.xkw.com/dksih/QBM/2021/10/15/2830081782095872/2830384435478528/STEM/92998edb-8c74-4077-812e-341d4e88de2d.png?resizew=279)
(1)求直线PB与直线AC所成角的余弦值.
(2)线段PB上是否存在点M,使得直线PD与直线CM垂直?若存在,求出
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b036f9e43b8c560aed40d1a3836094e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://img.xkw.com/dksih/QBM/2021/10/15/2830081782095872/2830384435478528/STEM/92998edb-8c74-4077-812e-341d4e88de2d.png?resizew=279)
(1)求直线PB与直线AC所成角的余弦值.
(2)线段PB上是否存在点M,使得直线PD与直线CM垂直?若存在,求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b505e0df1131e3a93fc81d13f6e224e7.png)
您最近一年使用:0次