如图,三棱柱
中,侧面
为
的菱形,
.
![](https://img.xkw.com/dksih/QBM/2018/3/8/1897678751105024/1898582824738816/STEM/381cd48f4f384ed989c229263fa7d0d2.png?resizew=227)
(1)证明:平面
平面
.
(2)若
,直线
与平面
所成的角为
,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/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f2e238b2757353026133bbe495645e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d31a4ddb10768e9e7868d0c34c425f.png)
![](https://img.xkw.com/dksih/QBM/2018/3/8/1897678751105024/1898582824738816/STEM/381cd48f4f384ed989c229263fa7d0d2.png?resizew=227)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3a59d7bf91a7540e35ce0011ad9b97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7870cee007535b979d35bc7feab75616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b94e97d085cea077cb82a0b7d2f523e.png)
更新时间:2018-03-09 19:39:33
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图,直三棱柱
的底面是边长为2的正三角形,
,
分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/2020/11/28/2602829359087616/2605631119958016/STEM/e4cf4ec9471a4e8581161af7c1feb80a.png?resizew=203)
(1)证明:
平面
;
(2)若
,求三棱锥
的高.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/2020/11/28/2602829359087616/2605631119958016/STEM/e4cf4ec9471a4e8581161af7c1feb80a.png?resizew=203)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ef8866ccf160ddc441bf69c5d3a3d5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2c0089d8eb23cb703c5278aff214cd2.png)
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【推荐2】如图,在直三棱柱
中,
为
上的点,
平面
;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/186ff346-db8e-4b63-83df-0ad4ed708737.png?resizew=184)
(1)求证:
平面
;
(2)若
,且
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f1e1439cf1d94968f6e22ccf2012b63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/547a4b438e2e6687c7cd55ea08bbaae2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/186ff346-db8e-4b63-83df-0ad4ed708737.png?resizew=184)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e53b212640dadf751ef7f65a78a209.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a02cfc067dc5299ebb16f6378f90ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ca8d240bf7949b4a0e3103ef1666f8d.png)
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【推荐3】如图,在多面体
中,四边形
是平行四边形,
平面
,
,平面
平面
.
;
(2)若
,
,求平面
与平面
的夹角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e89556992cbfd7043330ac7421d342.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2af93a2d53f7be058e4871f791c136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf84ed033bd035c2fe7552badd5e447d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa3254460ecbacecb3e57c5dce227f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eed15d0ed75bf936f224f931da5d950.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dfaabe2b62605491afc5d1120bd3306.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5741d6333e1e34f33998418e1ba19f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae8768996ca9a0f2c5d9a19abbd54df.png)
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名校
【推荐1】如图,在四棱锥
中,底面
为平行四边形,
是
与
的交点,
,
平面
是
的中点.
平面
;
(2)求直线
与平面
所成角的正切值.
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a22b02f6c8636152aeb62d191251e931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85e365901c74ce1eaec8e53891eaff5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ab80fa61dff2691284a5a3c0935c8e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30067b7b236d17af8a462f96a58d11bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af68a7bf0da4f7c6f739d2e2461ad9b7.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】如图,在四棱锥
中,底面为直角梯形,
,
,
垂直于底面
,
,
、
分别为
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/37c62d81-bf20-4c24-801b-e3d9d3b90319.png?resizew=139)
(1)求证:
;
(2)求
与平面
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edf7488ccaf26541626131bceb8f1069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/37c62d81-bf20-4c24-801b-e3d9d3b90319.png?resizew=139)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/962515007ca98ad2d36557b60a42ad6f.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a406f24b5131eb7da9127750319e52.png)
您最近一年使用:0次
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【推荐3】在如图所示的几何体中,
,
,
平面
,在平行四边形
中,
,
,
.
![](https://img.xkw.com/dksih/QBM/2018/2/28/1891928101380096/1893598663565312/STEM/44d261df00f34b7aa71a924ca2207966.png?resizew=193)
(1)求证:
平面
;
(2)求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75e2caa4eeaa40dccc441ed8ddcfeda7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a939a382fda79db678e8906b9ce3f865.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.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/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://img.xkw.com/dksih/QBM/2018/2/28/1891928101380096/1893598663565312/STEM/44d261df00f34b7aa71a924ca2207966.png?resizew=193)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81fa367ec317fe2a30142e1c30cce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37793a3a810e823e10c340986f55ddd.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37793a3a810e823e10c340986f55ddd.png)
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适中
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【推荐1】如图所示,在等腰梯形ABCD中,
,
,E,F为AB的三等分点,且
将
和
分别沿DE、CF折起到A、B两点重合,记为点P.
证明:平面
平面PEF;
若
,求PD与平面PFC所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30e9e26d127b0208e61a0ffcd0f8f37b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41caacf03f280c746bcc432adc182f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25d624d656d3598d454dc3523187cda4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57fc0d7ef3da457c990bc6e4051fb1e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5873cefbceea294ec3f684d7354487b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f84cbf4b49c16cf62242d92e36bea4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef7e4838df4bab7eaa98a954935b279f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/f487aafb-2da6-43c6-b37a-587b2179f9fa.png?resizew=227)
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(0.65)
解题方法
【推荐2】在几何体
中,
面
,直角梯形
中,
,
,且
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/98d8bbe6-f4ea-4678-9214-d79d8f8813b6.png?resizew=157)
(1)求证:平面
平面
;
(2)若直线
与平面
所成角的正切值为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0db71d869bf65bd8a6f9ab3a887a9ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.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/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65096f2be416307cfd3941b32e033f0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c26642662c83d2004794a3abf870a30.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/98d8bbe6-f4ea-4678-9214-d79d8f8813b6.png?resizew=157)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14172212b7b34eaf967c5a72233621c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10ca5b5fd1031438de2d2dd59be8c348.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce81faef7c631553e02d7468973a74cd.png)
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适中
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【推荐1】如图(1),△BCD中,AD是BC边上的高,且∠ACD=45°,AB=2AD,E是BD的中点,将△BCD沿AD翻折,使得平面ACD⊥平面ABD,得到的图形如图(2).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/545bf0a6-8f21-47f1-bd11-3e91eebd7d9d.png?resizew=416)
(1)求证:AB⊥CD;
(2)求直线AE与平面BCE所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/545bf0a6-8f21-47f1-bd11-3e91eebd7d9d.png?resizew=416)
(1)求证:AB⊥CD;
(2)求直线AE与平面BCE所成角的正弦值.
您最近一年使用:0次
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名校
解题方法
【推荐2】在三棱锥
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/49e3a74f-d76e-4bae-9c43-d5179464ca8a.png?resizew=183)
(1)求证:
;
(2)若点
为
上一点,且
,求直线
与平面
所成的角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9686570b9865d854970ad74cd1b938.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/49e3a74f-d76e-4bae-9c43-d5179464ca8a.png?resizew=183)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70734a8e672376bb0bd1522e229f86a2.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38b65a033fdfdfd9b2f92fcf6a6e9358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
您最近一年使用:0次