在直三棱柱ABC﹣A1B1C1中,AA1=1,AB=2,AC=1,∠BAC=60°,D为BC的中点.
![](https://img.xkw.com/dksih/QBM/2011/3/25/1570064628301824/1570064633683968/STEM/8c16c7f3-1818-49cd-af18-fb91214ea5ea.png?resizew=247)
(I)求证:平面ACC1A1⊥平面BCC1B;
(II)求直线DA1与平面BCC1B1所成角的大小;
(III)求二面角A﹣DC1﹣C的大小.
![](https://img.xkw.com/dksih/QBM/2011/3/25/1570064628301824/1570064633683968/STEM/8c16c7f3-1818-49cd-af18-fb91214ea5ea.png?resizew=247)
(I)求证:平面ACC1A1⊥平面BCC1B;
(II)求直线DA1与平面BCC1B1所成角的大小;
(III)求二面角A﹣DC1﹣C的大小.
2011·四川·一模 查看更多[1]
(已下线)2011届四川省高三普通高考考生知识能力水平摸底考试数学理卷
更新时间:2016-11-30 16:07:35
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解答题-证明题
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适中
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解题方法
【推荐2】如图,在直三棱柱
中,
,
分别为
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/56adc7c7-a43c-46e0-9b4b-7ec381053481.png?resizew=118)
(1)求证:
平面
;
(2)若
,
,求
与平面
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6853cf0a408492342e481e7958b036a7.png)
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(1)求证:
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(2)若
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适中
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【推荐3】如图在四棱锥
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(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
平面
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【推荐1】如图,在三棱柱
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适中
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解题方法
【推荐2】如图,在正四面体PABC中,点D,E,F,G,M分别是棱AP,AC,BC,PB,AB的中点.
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名校
【推荐1】如图,在四棱锥
中,底面
为矩形,侧面
是等腰三角形且
为
的中点,
在
上且
底面
.
侧面
;
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为正方形且侧面
为等边三角形时,求二面角
的平面角
的正切值.
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(2)当底面
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
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您最近一年使用:0次
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适中
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【推荐2】如图所示,在直三棱柱
中,
,
,
.
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(1)证明:
;
(2)求二面角
的余弦值.
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![](https://img.xkw.com/dksih/QBM/2011/5/31/1570227627343872/1570227632627712/STEM/20138f88fcbb4c3ba8acb329dcdc0beb.png?resizew=191)
![](https://img.xkw.com/dksih/QBM/2011/5/31/1570227627343872/1570227632627712/STEM/6418c2a146c3465987a2720c35b0540b.png?resizew=135)
(1)证明:
![](https://img.xkw.com/dksih/QBM/2011/5/31/1570227627343872/1570227632627712/STEM/132a4d82748244dbba9f9cd2440e3ed2.png?resizew=142)
(2)求二面角
![](https://img.xkw.com/dksih/QBM/2011/5/31/1570227627343872/1570227632627712/STEM/b9179174761d43f2a1c3deb3c26f8287.png?resizew=195)
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