名校
1 . 如图所示,已知长方体
中,
,
为
的中点,将
沿
折起,使得
.
![](https://img.xkw.com/dksih/QBM/2017/3/31/1655498603372544/1655671527243776/STEM/eedf1d77f8c146b3be95190bb8c18d65.png?resizew=531)
(1)求证:平面
平面
;
(2)是否存在满足
的点
,使得二面角
为大小为
?若存在,求出相应的实数
;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/100af11e6cb83b56437f2db7dadeb9f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e1e88b36ff71fe69c07bade0f95f1ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/804c0e2a375b5f4ff1c420532968efc3.png)
![](https://img.xkw.com/dksih/QBM/2017/3/31/1655498603372544/1655671527243776/STEM/eedf1d77f8c146b3be95190bb8c18d65.png?resizew=531)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb5012f6c70a1e98d682b6d021fadd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0760712e3e2ea02b755b751e760d0c55.png)
(2)是否存在满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaac8d2b8d350312c425b4f0dc5b8cd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a5266895d3c1fcb350a745bc779433b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
2017-03-31更新
|
1377次组卷
|
4卷引用:河南省息县第一高级中学2017届高三下学期第二次阶段测试理数试题
11-12高三下·江西·阶段练习
2 . 如图,在边长为4的菱形ABCD中,
.点E、F分别在边CD、CB上,点E与点C、D不重合,
.沿EF将△CEF翻折到△PEF的位置,使平面PEF⊥平面ABFED.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/15/f7acdd7c-b080-437a-952f-9a19d694e63d.png?resizew=699)
(1)求证:
平面
;
(2)设点Q满足
,试探究:当PB取得最小值时,直线OQ与平面PBD所成角的大小是否一定大于
?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e0b64d25ddd18454f88e40c45d7d8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54d26a9affebc45516c6d31b3caeb27.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/15/f7acdd7c-b080-437a-952f-9a19d694e63d.png?resizew=699)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83efd6afec2f73c52e4b027a12d9f817.png)
(2)设点Q满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf05e0ab4849f3e723d4ae6ba32cc606.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
您最近一年使用:0次
12-13高二上·浙江温州·期末
3 . 如图,在平行六面体
中,
,
,
,
(1)求
;
(2)求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cead0e8eadfdcefa334953e88864f424.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6906f59d09ce31956d6f5ea2b23fc77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7362be3007eef9e6cdcbdbdad769eab7.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b448365344987329313d7489c756d738.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://img.xkw.com/dksih/QBM/2012/2/20/1570755401695232/1570755406807040/STEM/7086ca2ef0864288a92edfb40ba20846.png?resizew=324)
您最近一年使用:0次
名校
4 . 如图,直三棱柱
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd80d2b2fba16ededd985bb8f2f162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/608aacfb144413733af4c90d8f36f8d7.png)
是棱
上的点,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ef85b3e613e0fa8b414e9dc6036f8ca.png)
![](https://img.xkw.com/dksih/QBM/2017/5/7/1682053838675968/1684054064553984/STEM/1f90ddd4-93a6-430e-9333-755a303f894d.png?resizew=149)
(Ⅰ)求证:
为
中点;
(Ⅱ)求直线
与平面
所成角正弦值大小;
(Ⅲ)在
边界及内部是否存在点
使得
面
存在,说明
位置,不存在,说明理由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd80d2b2fba16ededd985bb8f2f162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/608aacfb144413733af4c90d8f36f8d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ef85b3e613e0fa8b414e9dc6036f8ca.png)
![](https://img.xkw.com/dksih/QBM/2017/5/7/1682053838675968/1684054064553984/STEM/1f90ddd4-93a6-430e-9333-755a303f894d.png?resizew=149)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
(Ⅱ)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4739afd7311501e948aa4e1e5c1cb17.png)
(Ⅲ)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e21b3c5a71df7c74739468de3553057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d14954e270de014a275fbc17fded838f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次
2017-05-10更新
|
980次组卷
|
2卷引用:天津市南开中学2017届高三第五次月考数学(理工类)试题
5 . 如图,在边长为
的菱形
中,
为
的中点,点
为平面
外一点,且平面
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74b49162294082142a5c0611740587c.png)
![](https://img.xkw.com/dksih/QBM/2017/3/7/1638776523522048/1640230428409856/STEM/93a4388e71984c37a8b54000009d7730.png?resizew=129)
(Ⅰ)求证:
平面
;
(Ⅱ)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3c47a44aa80178e4c979859bc80429.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74b49162294082142a5c0611740587c.png)
![](https://img.xkw.com/dksih/QBM/2017/3/7/1638776523522048/1640230428409856/STEM/93a4388e71984c37a8b54000009d7730.png?resizew=129)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(Ⅱ)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
您最近一年使用:0次
2017-03-09更新
|
575次组卷
|
2卷引用:2017届浙江省台州市高三上学期期末质量评估考试数学试卷
6 . 如图所示,四边形
为等腰梯形,
为直角三角形,平面
与平面
垂直,
,
,点
、
、
分别是
、
、
的中点.过点
作平行于平面
的截面分别交
、
于点
、
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2017/3/7/1638705017585664/1639339676295168/STEM/9e14107022ac46eda70badff08f25581.png?resizew=149)
(Ⅰ)证明:
;
(Ⅱ)若直线
与平面
所成的角的正弦值为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17ff841d876a4574ca1fce9433410e01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17ff841d876a4574ca1fce9433410e01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/049ba02a6816033ade98e679a59a3b24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17ff841d876a4574ca1fce9433410e01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://img.xkw.com/dksih/QBM/2017/3/7/1638705017585664/1639339676295168/STEM/9e14107022ac46eda70badff08f25581.png?resizew=149)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12829cfe2646612e9ae7366f0b90e21e.png)
(Ⅱ)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1174142f3bba761585b6bc2653009b36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf2092e220fdd865d3a965ea86423942.png)
您最近一年使用:0次
2012·全国·一模
7 . (本题满分12分如图,四边形
为矩形,且
,
,
为
上的动点.
![](https://img.xkw.com/dksih/QBM/2012/3/19/1570809704964096/1570809710477312/STEM/aa232f59b7e742848de97c7e540a86ce.png?resizew=175)
(1) 当
为
的中点时,求证:
;
(2) 设
,在线段
上存在这样的点E,使得二面角
的平面角大小为
.试确定点E的位置.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13da96a673bb7d70c301e333b4ca994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502a46021ff0bd64fc4cd3bad7d8a826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2012/3/19/1570809704964096/1570809710477312/STEM/aa232f59b7e742848de97c7e540a86ce.png?resizew=175)
(1) 当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/248ddfad39864ab0e183e01f82859e72.png)
(2) 设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5886e79804341c12481970b3a0f809a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
您最近一年使用:0次
11-12高二上·江西宜春·阶段练习
8 . 如图,已知向量
,可构成空间向量的一个基底,若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd4dceb16009db466f96b2d2c1b299d8.png)
,在向量已有的运算法则的基础上,新定义一种运算
,显然
的结果仍为一向量,记作
.
![](https://img.xkw.com/dksih/QBM/2011/12/14/1570613901074432/1570613906800640/STEM/68a97dfc-0465-4c43-b0f3-3e1f2b0da236.png?resizew=173)
(1)求证:向量
为平面
的法向量;
(2)求证:以
为边的平行四边形
的面积等于
;
(3)将四边形
按向量
平移,得到一个平行六面体
,试判断平行六面体的体积
与
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f54d5e324c4a3d08481cbf26e7f361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd4dceb16009db466f96b2d2c1b299d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0fc29483e99ae14302fbf12964a9de6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd8e4b39343d2c1557a4210aa4f757bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d6c13f0f2b3b3ef5981d7fa3ff7f6b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20fcc07589519bc2dfdc579585998323.png)
![](https://img.xkw.com/dksih/QBM/2011/12/14/1570613901074432/1570613906800640/STEM/68a97dfc-0465-4c43-b0f3-3e1f2b0da236.png?resizew=173)
(1)求证:向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20fcc07589519bc2dfdc579585998323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
(2)求证:以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d071d008cdc313f6ed16a602f8a9669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b76ac232477ac6d4b0a36eded969d68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03bdc808dfcabe5199b3f3f98594b9b3.png)
(3)将四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b76ac232477ac6d4b0a36eded969d68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebca14060caa173dd7c922c560689064.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89ef3197505169e99f933fab8ff7b83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dcee40a45579d8c52db09dcd330d31c.png)
您最近一年使用:0次
解题方法
9 . 如图,在直棱柱
中,
,点
在棱
上,且
.
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572677414502400/1572677420670976/STEM/b44fdad5172144eab767f7ae3a74f793.png?resizew=288)
(1)求证:
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00f8446dff23dc04b2a39d9080ea52ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5a449fd2e042dd7868ed7076aa12472.png)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572677414502400/1572677420670976/STEM/b44fdad5172144eab767f7ae3a74f793.png?resizew=288)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/417104247ce266ae42c3a9860f387272.png)
(2)求二面角
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