如图,在三棱锥V-ABC中,平面VAB
平面ABC,
为等边三角形,
,且AC=BC=
,O,M分别为AB,VA的中点.
![](https://img.xkw.com/dksih/QBM/2016/11/11/1573141053112320/1573141058715648/STEM/17a95fd684d543218f0fec5d33d9fc1f.png?resizew=174)
(1)求证:VB//平面MOC;
(2)求三棱锥V-ABC的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f63075fdeeb9e765dd696c4ff43ba1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2016/11/11/1573141053112320/1573141058715648/STEM/17a95fd684d543218f0fec5d33d9fc1f.png?resizew=174)
(1)求证:VB//平面MOC;
(2)求三棱锥V-ABC的体积.
16-17高三上·贵州遵义·阶段练习 查看更多[8]
更新时间:2016-12-05 00:26:35
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相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图,已知三棱柱
,平面
平面
,
,
,
,
、
分别是
、
的中点.
![](https://img.xkw.com/dksih/QBM/2023/4/23/3222630134636544/3222747541839872/STEM/0c095d1949db478d9916e5d064c139e0.png?resizew=186)
(1)证明:
;
(2)若
求
的体积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0671b4776e142e17a79af5b3f0378ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af260e0d98c95d1e092dc4c6d348e3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4020513c097ba34df4b42e297f892cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70aadc0083a7d87fe96b6b6675ff37c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://img.xkw.com/dksih/QBM/2023/4/23/3222630134636544/3222747541839872/STEM/0c095d1949db478d9916e5d064c139e0.png?resizew=186)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec27f90f9ce81784f7b09981c3938b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3205e4c6328a708c2f7f9bd40bf3762f.png)
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【推荐2】如图所示的三棱柱
中,
平面
,
,
,
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/2020/4/16/2442951017054208/2443440587390976/STEM/f30475e1ca45463b9e9d283a4814a92f.png?resizew=183)
(Ⅰ)求证:平面
平面
;
(Ⅱ)求平面
切割三棱柱
所得的包含顶点
部分的几何体的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c37d718ebfab73143e73f760273fdf79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/217feaa093475bdef6abcdff4eb5d689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08edf9270775b49b15029b8f2c480280.png)
![](https://img.xkw.com/dksih/QBM/2020/4/16/2442951017054208/2443440587390976/STEM/f30475e1ca45463b9e9d283a4814a92f.png?resizew=183)
(Ⅰ)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94b85a145f7005af0ed86afa0b99ab32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a211ad5a06b505b8365a62c1946f3cb7.png)
(Ⅱ)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在三棱柱
中,
平面
,
是
的中点,
,
.
平面
;
(2)求异面直线
与
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ecf072589c0f901d92f6bda111d841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71807a35b3170fce28ee6edf4c00d083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8c7dd3d75c329fbd5783e09f94aa40c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/896e293411e2fd0da215ff20781cb36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba9e20d667d04bf3ee7f55cc795ce01.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2eb89294b31ffdd2680b4361e8994d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.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
中,侧面
底面ABCD,
,
,
,
,E,F分别是SC和AB的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/9ddbb321-3b90-4943-9976-dbfd3ebbb5f6.png?resizew=230)
(1)证明:
平面SAD;
(2)点P在棱SA上,当
与底面
所成角为
时,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235d1553f6806c1eee3b17b94d23f0f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e03766e254c3185d20f5f6d93fa6950d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3165e97ffc02c3d21a79f4e9f34ff368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42bcbc8c13e55d56ca7c483a778e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc0cedfb76e95ae3371fad58069554ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a58a622e2b1a239f2f96aa1501e9799.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/9ddbb321-3b90-4943-9976-dbfd3ebbb5f6.png?resizew=230)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
(2)点P在棱SA上,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abff725851bf24e35a4818af2e85c5c5.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐3】如图,直三棱柱
中,
,
、
分别为
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/d1c211fa-5da2-4cce-90dd-706a769ef6d3.png?resizew=156)
(1)求证:
平面
﹔
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39e8a50eb8b05d9b6950911b93625c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/d1c211fa-5da2-4cce-90dd-706a769ef6d3.png?resizew=156)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18cdf258eb8bca2ee1ead36140c64539.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a1cd90c6e9fe724933dc2b15a787098.png)
您最近一年使用:0次