已知
是边长为1的正方形,
分别为
上的点,且
沿
将正方形折成直二面角
.
![](https://img.xkw.com/dksih/QBM/2011/5/5/1570180050968576/1570180056219648/STEM/1ab743b6-44f3-4d1f-98e6-6c9df53de6a2.png?resizew=186)
(1)求证:平面
平面
;
(2)设
点
与平面
间的距离为
,试用
表示
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe0ea089c1ab5734695a9494a70ee7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab499a125b73e16404b7494ab5c9477.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de54921b7079102fd045f63335f05e9.png)
![](https://img.xkw.com/dksih/QBM/2011/5/5/1570180050968576/1570180056219648/STEM/1ab743b6-44f3-4d1f-98e6-6c9df53de6a2.png?resizew=186)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06123e81c41198c76a3335757fac2c93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e8a20c1fc8a5620db5db3a74eb01201.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b12c4c39fe9a95659d9389338fcd557.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d78fc7fcb2762de28dcef8aa3aa0e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
10-11高二下·浙江杭州·期中 查看更多[2]
更新时间:2016-11-30 20:02:24
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在三棱锥
中,
,其中
分别是
的中点.
平面
;
(2)求点
到平面
的距离;
(3)求直线
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,四棱锥
的底面是
,
的矩形,侧面
是等边三角形,且侧面
底面
﹒
(1)证明:侧面
侧面
;
(2)求侧棱
与底面
所成的角;
(3)求直线
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的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)证明:侧面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求侧棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://img.xkw.com/dksih/QBM/2012/5/16/1570855825743872/1570855831330816/STEM/c5855215b8f64eebbf048ae1e004e72c.png?resizew=188)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】如图所示的多面体由一个四棱锥和一个三棱柱组合而成,四棱锥
与三棱柱
的所有棱长都为2,
.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25d4155f5701138a3ad3207e67dcd66a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4895f682a46bafd3df522cee827ae2d5.png)
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您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图所示,已知棱长为a的正方体
,E为BC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/37e99820-ed99-4205-8d08-c0ca2a70bfae.png?resizew=164)
(1)求证:平面
平面
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(2)求直线DC和平面
所成的角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/37e99820-ed99-4205-8d08-c0ca2a70bfae.png?resizew=164)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2077d0cddb425e18a7f7d5d230a8c539.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1918cb669121bfe6ab3bf2431553aff8.png)
(2)求直线DC和平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1918cb669121bfe6ab3bf2431553aff8.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐2】在四棱锥
中,底面
是正方形,若
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/67642a9b-67e9-4804-bf7a-bb6cc83b8471.png?resizew=152)
(1)求证:平面
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;
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c6caa0455442437177ab9b995df37b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a3d0f667ef7ca851f514f2e742a8624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a512bcb83a2e952d2f1f877f1ceaa5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/67642a9b-67e9-4804-bf7a-bb6cc83b8471.png?resizew=152)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb11df029afb11e4233989b1338cb3a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64484f96568410926e0c50898eba6e32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92c92ee8494e400263e2f0effabf573f.png)
您最近一年使用:0次