如图,已知三棱台
,平面
平面
,
和
均为等边三角形,
,O为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/58a688b5-ad13-496b-9aa7-11ad5c55886a.png?resizew=178)
(1)证明:
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df00cdf77ed39ca5a0b305861a693142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c3135fa20c32d04a270750f77c1f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1689f4b9fb5347129d0e5eb99d7391cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/58a688b5-ad13-496b-9aa7-11ad5c55886a.png?resizew=178)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5161b4861f1aecdb0c2763b6ab29eb37.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0fc6cf34323f80b94fe2a9d0867d62e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
19-20高二上·浙江湖州·期末 查看更多[2]
更新时间:2020-02-09 22:13:09
|
相似题推荐
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,直棱柱
的底面是菱形,
分别为棱
,
的中点,
.
![](https://img.xkw.com/dksih/QBM/2020/11/27/2601825945821184/2609288160927744/STEM/fe9e67d9b17d4507a2c3974c1101e50c.png?resizew=227)
(1)求证:
;
(2)若
,求几何体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a0b29cc24e75be59cbaa5c60a4b4c6e.png)
![](https://img.xkw.com/dksih/QBM/2020/11/27/2601825945821184/2609288160927744/STEM/fe9e67d9b17d4507a2c3974c1101e50c.png?resizew=227)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6155f82a6f64b20085976cea9b64193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75a4ffebfed74d8f8ffa8f4b4757093a.png)
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解题方法
【推荐2】已知在四棱锥
中,
平面
,四边形
是直角梯形,满足
,若
,点
为
的中点,点
为
的三等分点(靠近点
).
平面
;
(2)若线段
上的点
在平面
内,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4225f09d1f452c7968a038abb5c57e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/648233d5748c11276ed762bae2a1ad57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885efcff0b903e314057dd153578600.png)
(2)若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885efcff0b903e314057dd153578600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/450613b1e166a71f8c17c93f7dcbab97.png)
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名校
【推荐1】在等腰梯形
中,
为
的中点,线段
与
交于
点(如图).将
沿
折起到
位置,使得平面
平面
(如图).
(1)求证:
;
(2)线段
上是否存在点
,使得
与平面
所成角的正弦值为
?若存在,求出
的值;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/87c57474fc297ae837c0034f0317e35e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6829c6214e60edbfbf1e31601c6bcb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef5eaccad94e055c4bd1a9c134022eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/14f63379-0947-4b6c-8768-ab5d16e989ca.png?resizew=340)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c103ab3f38f0e7930bcda84d8e190741.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be451ce5fad246389ccf4864929d81d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e95fa1c3bcd3d0464fcadf248e90ace.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80dbac2006d30c49943f0241fd976eb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b188172a322d69106c638e1603ac13f.png)
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【推荐2】如图,在圆柱
中,点
、
分别为上、下底面的圆心,平面
是轴截面,点
在上底面圆周上(异于
、
),点
为下底面圆弧
的中点,点
与点
在平面
的同侧,圆柱
的底面半径为1,高为2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/3053f060-aacd-4de2-838a-c0a65466049a.png?resizew=135)
(1)若平面
平面
,证明:
;
(2)若直线
与平面
所成线面角
的正弦值等于
,证明:平面
与平面
所成锐二面角的平面角大于
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e8e1c05117a74de20bcc5d825b1c29d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e8e1c05117a74de20bcc5d825b1c29d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/3053f060-aacd-4de2-838a-c0a65466049a.png?resizew=135)
(1)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5be220774a3a9212d914f6d8b7b83e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdf252d6b6870710f886f223640c88b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beea55954ee1af4dc6924c09014ebd9f.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9d2abf13c2842f58654abf73c6b4ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a110162fab3f815ecba44471b3ce5e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83303d3784492506fc44f2b4d6b07bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdf252d6b6870710f886f223640c88b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e8e1c05117a74de20bcc5d825b1c29d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
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解答题
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【推荐3】如图,等腰直角
与梯形
所在的平面垂直,且
,
,
,
,
,
为
中点.
(1)证明:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4020b47658346639e42836fea8e672c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b6a63b5590530bdc5a254489cf2b212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99d2b7b1c72487fdb8b1089a6317d6c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed9727fd50173b6c5b15e13038ec3aea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13efd2b5236b93d982847ecf97efbf12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252053b853152bd294a8315debd00b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c0a8dae112675431078b896e724c3cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf12905647aeeded72bbca21a63f319.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b8890d630c88be68fba6044e2bce720.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/31/a7706209-2614-4455-a54f-62ebe87426aa.png?resizew=235)
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解答题-问答题
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解题方法
【推荐1】如下图所示,在四棱锥P - ABCD中,底面ABCD为平行四边形,且∠BAP =∠CDP =90°.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/94881c8d-a7d0-4f30-8020-5a57ba613fc1.png?resizew=162)
(1)证明:平面PAB⊥平面PAD;
(2)若PA=PD=AB,PA⊥PD,求直线PA与平面PBC所成角的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/94881c8d-a7d0-4f30-8020-5a57ba613fc1.png?resizew=162)
(1)证明:平面PAB⊥平面PAD;
(2)若PA=PD=AB,PA⊥PD,求直线PA与平面PBC所成角的余弦值.
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【推荐2】如图,在几何体ABCDEF中,四边形ABCD是菱形,BE⊥平面ABCD,DF∥BE,且DF=2BE=2,EF=3.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/27/e4345aac-d4b3-4101-8530-e58137d8bd5c.png?resizew=156)
(1)证明:平面ACF⊥平面BEFD;
(2)若二面角A-EF-C是直二面角,求直线AE与平面ABCD所成角的正切值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/27/e4345aac-d4b3-4101-8530-e58137d8bd5c.png?resizew=156)
(1)证明:平面ACF⊥平面BEFD;
(2)若二面角A-EF-C是直二面角,求直线AE与平面ABCD所成角的正切值.
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