如图,平面
平面
,四边形
和
是全等的等腰梯形,其中
,且
,点
为
的中点,点
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/f6aea333-2876-47ee-bce5-0ee8fc933c8a.png?resizew=201)
(1)求证:
平面
;
(2)请在图中所给的点中找出两个点,使得这两点所在的直线与平面
垂直,并给出证明 ;
(3)在线段
上是否存在点,使得
平面
?如果存在,求出
的长度;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d53aeabf77688e80280d23d766b4c45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf8be22425679fbdc28350119f68c274.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61ba6f4177822927b5875b92cd5f2038.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf8be22425679fbdc28350119f68c274.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa27807f9f01ca628a232398c712373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ee278ec8164c0ca89b79d707a72732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/f6aea333-2876-47ee-bce5-0ee8fc933c8a.png?resizew=201)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a95beabc50316cb3394397998d3a2b2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf8be22425679fbdc28350119f68c274.png)
(2)请在图中所给的点中找出两个点,使得这两点所在的直线与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb093f3dfd9b79be8fd6be9f202e27dd.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb5fc14f458801f8e678add5da75bc21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb093f3dfd9b79be8fd6be9f202e27dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
更新时间:2018-01-19 12:44:15
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,在五面体ABCDPE中,PD⊥平面ABCD,∠ADC=∠BAD=90°,F为棱PA的中点,PD=BC=
,AB=AD=1,且四边形CDPE为平行四边形.
![](https://img.xkw.com/dksih/QBM/2018/6/15/1967883896307712/1968997420621824/STEM/057d4b8f250d411b871b46fda3164f0f.png?resizew=115)
(1)判断AC与平面DEF的位置关系,并给予证明;
(2)在线段EF上是否存在一点Q,使得BQ与平面PBC所成角的正弦值为
?若存在,请求出QE的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2018/6/15/1967883896307712/1968997420621824/STEM/057d4b8f250d411b871b46fda3164f0f.png?resizew=115)
(1)判断AC与平面DEF的位置关系,并给予证明;
(2)在线段EF上是否存在一点Q,使得BQ与平面PBC所成角的正弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a8b76e36783a69d14ec54af82c7df0.png)
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【推荐2】如图,在几何体
中,平面
底面ABC,四边形
是正方形,
,Q是
的中点,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a84772c7cd0e0579f48ec441d553344c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/c58cead6-9a42-4d03-a40e-c90e58fd4cd9.png?resizew=180)
(I)求证:
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e53b212640dadf751ef7f65a78a209.png)
(Ⅱ)求二面角
的余弦值.
![](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/31e53b212640dadf751ef7f65a78a209.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/527e3cdc2dcf5e772f11d540cb1714ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a84772c7cd0e0579f48ec441d553344c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/c58cead6-9a42-4d03-a40e-c90e58fd4cd9.png?resizew=180)
(I)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10b2a78c34b0fb48382f529624aabf04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e53b212640dadf751ef7f65a78a209.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ffef235354f88fe062d31813e1fe56f.png)
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适中
(0.65)
【推荐1】如图,已知长方体
中,
,
.
为
的中点,平面
交棱
于点F.
![](https://img.xkw.com/dksih/QBM/2022/1/12/2892711865237504/2892979691831296/STEM/acf7e537-0f60-406d-8cf4-dd7d5078a83b.png?resizew=210)
(1)求证:
;
(2)求二面角
的余弦值,并求点A到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27db558e8db4c957654c8e5cecd2d2dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad1a56baf43ffdf67bc8460856e31fec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c565ac177fa0b9958553ea83b580c43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://img.xkw.com/dksih/QBM/2022/1/12/2892711865237504/2892979691831296/STEM/acf7e537-0f60-406d-8cf4-dd7d5078a83b.png?resizew=210)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d568bb52b7ce2a3d0459e6d11990de3.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fad27a66337f663e7f1bcb83ecae0b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c565ac177fa0b9958553ea83b580c43.png)
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【推荐2】如图,多面体
中,四边形
为平行四边形,
,
,四边形
为梯形,
,
,
,
,
,平面
平面
.
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值;
(3)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.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/921a71040d18df8b33bc41995675a586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d5a164bf56f8fb92527ad78bc10ccf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dced11455b3e31a9090915f80a046fa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddbb52f9b226b1db3f6f9f055948bd38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6370d6c626bdabf1fc694501ee6c714f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56512504254ab7f574a717dd6830fb33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c6f6c2de974e341da82150b7373c16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d5a164bf56f8fb92527ad78bc10ccf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/24/5ad85ab5-0687-4a02-b424-7c57e08cf6ca.png?resizew=240)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31c34b18525831f3eda7bb90be0199b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
(3)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
【推荐1】已知在直三棱柱
中,
分别为棱
和
的中点,若
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/218d1b49-e6cc-458e-9993-281b12f8f9d6.png?resizew=161)
(1)若
,求三棱锥
的体积;
(2)延长
交于点
,连接
交
于点
,证明:平面
平面
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e393c808bd5af2cb502f22d54e1901b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/218d1b49-e6cc-458e-9993-281b12f8f9d6.png?resizew=161)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d572b24c3b4549b7fd579d5706c5970.png)
(2)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09f5c21451bc59f678aab552b95c53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d8e33929752b1cb4dd36ee9b98b45d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e92eb4a165019d7d3b2ee20680603c66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
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解答题-证明题
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(0.65)
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解题方法
【推荐2】如图,在四棱锥
中,底面
是边长为2的正方形,且
,
,点
分别为
的中点.
平面
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2021e9a92da1fe034e8aa705d7307be9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/752d983931c62842c914b74781ea531a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
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解答题-问答题
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适中
(0.65)
【推荐3】如图,在四棱锥
中,平面
平面
,
,
,
,
.
(1)证明:
平面
.
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17580410bf63dba4fe164265afaac4cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e73ff18fab460a2bc8d21cc522527e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/292d0b9ce587bd5df884a988c22ccba2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd316249a2a4333a6e37ea6ba4c0e67b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71807a35b3170fce28ee6edf4c00d083.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/19/9465d634-9cb6-4c05-9a53-12796388787b.png?resizew=174)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98e384e0ffc3d599303b77ee2a12221e.png)
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【推荐1】如图所示,在四棱锥
中,底面
是边长为2的正方形,侧面
是以
为斜边的等腰直角三角形,且平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/136324c4-3415-436e-8efa-54f5aadc3c1c.png?resizew=203)
(1)求证:
平面
;
(2)求证:
:
(3)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/136324c4-3415-436e-8efa-54f5aadc3c1c.png?resizew=203)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5edfe97aeab0cf16b40fa9d2e15f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0530f462e5ec1e58c46e1f7644d0cc21.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】如图,在三棱柱
中,
,
,平面
平面
,
为
中点.
![](https://img.xkw.com/dksih/QBM/2018/5/8/1941134183358464/1942339713712128/STEM/e5f4f96b011e4219951db3a1b1689635.png?resizew=178)
(1)求证:
;
(2)若
直线
与平面
所成角为
,求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929fad66226226ceff3b3252c60d9ed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50d9bdbbdfabc737323692c796e41930.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/2018/5/8/1941134183358464/1942339713712128/STEM/e5f4f96b011e4219951db3a1b1689635.png?resizew=178)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a27bad0636a087e38bb1d253d66a231d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/133380070b96b414af75ee0352d1045a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07350b106ef6b3e89063ff10709b4806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30c20e88a33043f4279fff360c81006e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914d46f7e72b55d2ff3d9bc38e02b31d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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(0.65)
【推荐3】如图,以C为直角顶点的等腰直角三角形
所在的平面与以O为圆心的半圆弧
所在的平面垂直,P为
上异于A,B的动点,已知圆O的半径为1.
![](https://img.xkw.com/dksih/QBM/2022/5/23/2985594694189056/2985854479982592/STEM/2a59b342-ab12-43f2-b280-2a5cb5c1612d.png?resizew=280)
(1)求证:
;
(2)若二面角
的余弦值为
,求点P到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://img.xkw.com/dksih/QBM/2022/5/23/2985594694189056/2985854479982592/STEM/2a59b342-ab12-43f2-b280-2a5cb5c1612d.png?resizew=280)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87640faca8fff9c4b376ba21ecb5b9dc.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b796bbaeb8450404c2d146283562006e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e468f168f3657d84d44be5eb89a62d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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