如图,在等腰梯形
中,
,
,
,
平面
,
,且
,
,Q分别是线段
,AB的中点.
![](https://img.xkw.com/dksih/QBM/2021/8/23/2792251190542336/2795344100876288/STEM/0bb71fd6-e6c0-4b76-9715-57161a75b90c.png?resizew=298)
(1)求证:平面
平面
;
(2)求证:PQ
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b96fac11d72f72c805dbddb8da72d68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7839dc3cab5f2bf59f8830d8b3966794.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f09ad78d4eccd1a9c9ccd3c4af79c79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86bd2ff460ff8dbaf1d93a299b5a173a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49d687bea28cb8cb8466dd606546dde3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2021/8/23/2792251190542336/2795344100876288/STEM/0bb71fd6-e6c0-4b76-9715-57161a75b90c.png?resizew=298)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39282bdf319f30d7bc261e2e3ab3b1e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.png)
(2)求证:PQ
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce1ddb7003591b033b1a58dc55ede7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
更新时间:2021-08-27 19:25:02
|
相似题推荐
解答题-作图题
|
适中
(0.65)
解题方法
【推荐1】如图,P是
所在平面外一点,
分别是
和
的中点,试过点
做平行于
的平面
,要求:
(1)画出平面
分别与平面
,平面
,平面
的交线;
(2)试对你的画法给出证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.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/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/29/b36b224b-7eb1-421b-8fdb-9c86e2f64363.png?resizew=140)
(1)画出平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)试对你的画法给出证明.
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解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】在四棱锥
中,底面
为矩形,
,其中
.
![](https://img.xkw.com/dksih/QBM/2017/8/13/1751284352540672/1752645485199360/STEM/716c5fdd677742c59f41cdcf4b783526.png?resizew=191)
(1)点
分别为线段
中点,求证:
平面
;
(2)设
为线段
上一点,且
,求证:
平面
.
![](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/bafa8c14100a4f847b41b9148954116c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4edc2d31b8455497cccf759df7053425.png)
![](https://img.xkw.com/dksih/QBM/2017/8/13/1751284352540672/1752645485199360/STEM/716c5fdd677742c59f41cdcf4b783526.png?resizew=191)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d630303a12b393c005a501ced6e589c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c7a937699f989b685f285041434000.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa0d8cc5869cc7e551dd4e204c58ec68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5354678a1506d618705514de0f09535.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
解答题-问答题
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适中
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名校
【推荐3】如图,在四棱锥
中,底面ABCD为直角梯形,
,
,
平面ABCD,Q为线段PD上的点,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/17/71beebd0-e308-4c1b-afb3-59d5807d0846.png?resizew=171)
(1)证明:
平面ACQ;
(2)求直线PC与平面ACQ所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f95475bfc06e884754eb4a455c3f434e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a57ebf5c4ff8cd7f0908b517315a29f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7ae4091a3a2767fde8e9f5a604c1a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/17/71beebd0-e308-4c1b-afb3-59d5807d0846.png?resizew=171)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f475878dd1b32b0486cbf7b5ffbedd2.png)
(2)求直线PC与平面ACQ所成角的正弦值.
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解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】如图(一)所示,四边形ABCD是等腰梯形,
,
,
,
,过D点作
,垂足为E点,将
沿DE折到
位置如图(二)所示,且
.
![](https://img.xkw.com/dksih/QBM/2022/8/29/3054815214895104/3064118170517504/STEM/a583a54699dd497e852a2bf2e8adc357.png?resizew=260)
(1)证明:平面
平面EBCD;
(2)已知点P在棱
上,且
,求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bdb3995265a321989202ff01001013d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ed75e65e7374c38ffb1f75259a8beb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e92fed536087a6c2e8c44296b81a1d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7192de8501f2fe79218ddcc053fb1fb.png)
![](https://img.xkw.com/dksih/QBM/2022/8/29/3054815214895104/3064118170517504/STEM/a583a54699dd497e852a2bf2e8adc357.png?resizew=260)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a965d0e52a2545b9a6ef62a9a6048d27.png)
(2)已知点P在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07771c253f6bc48c20c9dc95483bf141.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b1a61ea11e0fd4d6103a32d16f9e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f1bb063892dfd8f301d327e2f68feb.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐2】四棱锥
中,
底面
,四边形
是菱形,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/76f47614-82fd-4702-84b1-c143c883733e.png?resizew=164)
(1)求证:平面
平面
;
(2)设点
为棱
的中点,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/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/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83a04565a8ebaa111894b724b0ba266.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/76f47614-82fd-4702-84b1-c143c883733e.png?resizew=164)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(2)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
您最近一年使用:0次