如图,在四棱锥
中,底面
是矩形,且
,
,
平面
,
、
分别是线段
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/1/8a7462c6-c92d-4ed5-a22b-ddd652e46b9b.png?resizew=168)
(1)证明:
;
(2)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/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96127e45e2dd2494fccb1c0905951f0b.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/1/8a7462c6-c92d-4ed5-a22b-ddd652e46b9b.png?resizew=168)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d603566c74b1d5de510a2e8f7859010.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0901e2f5cefe6468cbbcaa332287d63.png)
更新时间:2024-02-01 11:50:55
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】如图所示,在四棱锥
中,
为等腰直角三角形,且
,四边形ABCD为直角梯形,满足
,
,
,
.
;
(2)若点E为PB的中点,点M为AB上一点,当
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa3f47f7c8e18b5e501c9bddeda0a547.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4ab7e657f01bdfa235f8c4d6681d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd60919c09876f29ff699b790f701f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58ff26d9121c651ed648f0eafe293fd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6c996b7688b88d9df08c2f6508be46e.png)
(2)若点E为PB的中点,点M为AB上一点,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd73c19b1eb4bbb11efac224aa29e97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6744bbb4c871543896dd2a8acbe297c3.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】如图,在三棱锥
中,
,
,
两两垂直,
,平面
平面
,且
与棱
,
,
分别交于
,
,
三点.
![](https://img.xkw.com/dksih/QBM/2018/5/23/1951678313824256/1952933369798656/STEM/87ddd21a520e45019a0dea3377f01162.png?resizew=156)
(1)过A作直线
,使得
,
,请写出作法并加以证明;
(2)若
将三棱锥
分成体积之比为
的两部分(其中
的体积更小),
为线段
的中点,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e43f6eb62e48e72e06361138e0d1e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.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/78f4235bce509940f8f7fb0ca9ee1345.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32141fcc158ce9d87532092dfe3725f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07c9121cede0ee0562e23b8a26b34616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4f1b40221f57567c67c1ba5ceb2f57b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9721059d158853671eaf19e39769b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0758f3ff9f1f7109024c1ef65536c58.png)
![](https://img.xkw.com/dksih/QBM/2018/5/23/1951678313824256/1952933369798656/STEM/87ddd21a520e45019a0dea3377f01162.png?resizew=156)
(1)过A作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a159de0b2d9eb1ae0b7e664e64d3c6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7609c21147d4fc37e9268974cde61da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db6325ab9ab5b6334809df7af8a4cef0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07c9121cede0ee0562e23b8a26b34616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e43f6eb62e48e72e06361138e0d1e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e71c4c6368acaabb14efc2cfd0ed365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b575c223f5ff124f95346949d7b2a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/289d7a880379d6060065c829b45b0ed6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/488c9cb4d88938d832617f520a3ca951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8635d5596a3dba186d2e551dd0ccd7b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90fa72b4a24aeab96fa747e8abda00d3.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐3】如图,四棱锥
中,四边形
是边长为4的菱形,
,
,
是
上一点,且
,设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/c3faba9b-f724-4956-af05-48ac24365e6a.png?resizew=306)
(1)证明:
平面
;
(2)若
,
,求二面角
的余弦值.
![](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/8cb96e0331eebe80ed1ff610faf531fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/712f7375b4ede5f75c0d81870c0f86af.png)
![](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/8dad2400ca89c8757264ad37a96fdf45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a23f01af749100e1888bba06268843db.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/c3faba9b-f724-4956-af05-48ac24365e6a.png?resizew=306)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f138877b595987abf3397aab8f9895e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d2ed7474932ac3959108f2b835acf98.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在四棱锥
中,底面
是边长为2的正方形,
底面
,
为
的中点,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/fdd9eab8-da24-463a-9569-0a61c802d3a2.png?resizew=166)
(1)求证:
平面
;
(2)求异面直线
与
所成角的正切值的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a5faf3cbb633fc4294c8ce703c64c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4317430d5a2b61d9a2a88b73e7d7ad39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ad7fc6746e60eeaf5cc656b841e00b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/fdd9eab8-da24-463a-9569-0a61c802d3a2.png?resizew=166)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3201d3796ed9a29338aac25245a7c8e2.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】如图,在四棱锥
中,底面
是平行四边形,
,
,M,N分别为
,
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/ad987034-7d31-4719-9028-8290fb01c971.png?resizew=183)
(1)证明:
;
(2)若
,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/f7dbf31dfd36aa456a63bafea8bc1985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7665a876f603a09df082d2cad8ab0a59.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/ad987034-7d31-4719-9028-8290fb01c971.png?resizew=183)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cf63de02e57c8e45e4f78fa4b5e6bbf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb28f1ebbdcd6c304d8a8d0ea28aae0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】过四棱柱
的顶点A作截面AEFG,其中底面ABCD是菱形,∠BCD=60°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/fc8b3b42-173d-4318-b738-a30cea1e0bc0.png?resizew=210)
(1)证明:截面AEFG是平行四边形;
(2)已知
ADG是正三角形,平面ADG⊥平面ABCD,且AB=2,CF=3,求直线DF与平面BCFE所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/fc8b3b42-173d-4318-b738-a30cea1e0bc0.png?resizew=210)
(1)证明:截面AEFG是平行四边形;
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,在长方体
中,
,
,P是线段BD上一点.
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901515308113920/2902785141063680/STEM/f7f98d07-0b46-4bfd-a722-d85556eb54a4.png?resizew=213)
(1)若
,求证:
平面
;
(2)若二面角
的大小为
,
,求直线
和平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d0fdc5a00ca0e857b89a7e1420df29.png)
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901515308113920/2902785141063680/STEM/f7f98d07-0b46-4bfd-a722-d85556eb54a4.png?resizew=213)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65edfb3bd04ef0871d03158f09616542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51e89acc2b46a2ff0e61c894c56382b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d041feacf189306d130f4a949880bfc8.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a2559aacec9c6daa107abb1387e8ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d728988d6c6d441975e5ec0d3c383b70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79039b211d151710a15fc9dda11d6225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d041feacf189306d130f4a949880bfc8.png)
您最近一年使用:0次