如图,在四棱锥
中,底面
为直角梯形,
,
平面
,
,点
分别在线段
和
的中点.
平面
;
(2)求平面
与平面
夹角.
![](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/405effb49ef901476701e72cc47918da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f95475bfc06e884754eb4a455c3f434e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd706c0e3aa382425502a1262dc6b735.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c7c261740ac2ae26715e1298ca278a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab5f236e0c248607721ff77b6ea8b6ee.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab5f236e0c248607721ff77b6ea8b6ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b81fb655624ff75a5eab94de9b8c8e9.png)
更新时间:2024-06-08 15:55:06
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在四面体
中,
平面
,
,
,
,且
,
,
分别为
,
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/7f3e2be8-36dc-4cf0-bc9a-2f8fe03da3d0.png?resizew=189)
(1)求证:
平面
;
(2)
是棱
中点,求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/7f3e2be8-36dc-4cf0-bc9a-2f8fe03da3d0.png?resizew=189)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52aef9d1132740cff16178519f2e3d74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,已知
平面BCD,平面
平面ACD,E,F分别是AD,AC的中点.
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898537994797056/2902076049899520/STEM/479fbd6328bc400ba5352a86c32f56f9.png?resizew=158)
(1)求证:
;
(2)若
,直线BD与平面ABC所成角为30°,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898537994797056/2902076049899520/STEM/479fbd6328bc400ba5352a86c32f56f9.png?resizew=158)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/965b45ac7e3e6f8f4b03cff512a3f7d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc3bf74119692ac98eb24fcfa2a3f9f.png)
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【推荐3】在等腰
中,
,腰长为2,
、
分别是边
、
的中点,将
沿
翻折,得到四棱锥
,且
为棱
中点,
.
![](https://img.xkw.com/dksih/QBM/2019/5/14/2203473345437696/2203577458155520/STEM/2b5ca5f7587f4b5da68fee1f62db2f96.png?resizew=268)
(1)求证:
平面
;
(2)在线段
上是否存在一点
,使得
平面
?若存在,求二面角
的余弦值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/315f2329bfd431a843f4a4d33712ffa3.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/afa53abf5662cdd7b9943be264400b40.png)
![](https://img.xkw.com/dksih/QBM/2019/5/14/2203473345437696/2203577458155520/STEM/2b5ca5f7587f4b5da68fee1f62db2f96.png?resizew=268)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f445af1ae136773cb338920552ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efb49d869110f27140f5c1934143db2e.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dcafa398cc6b6079883e7ad153eb62d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ce9e1664f888e70b0bec872178dccd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18592ae87b1d30faba1a0b9b5e7542e1.png)
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解答题-问答题
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【推荐1】如图,已知四棱锥P-ABCD的底面为直角梯形,AB∥DC,∠DAB=90°,PA⊥底面ABCD,且PA=AD=DC=1,AB=2,M是PB的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/0c05c55d-7aff-4376-b647-e5ffaf419d8e.png?resizew=166)
(1)证明:平面PAD⊥平面PCD;
(2)求AC与PB的夹角的余弦值;
(3)求二面角A-MC-B的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/0c05c55d-7aff-4376-b647-e5ffaf419d8e.png?resizew=166)
(1)证明:平面PAD⊥平面PCD;
(2)求AC与PB的夹角的余弦值;
(3)求二面角A-MC-B的余弦值.
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐2】如图,已知三棱柱
,平面
平面
,
,E,F分别是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/e5593516-4ec8-4873-87bd-fef44e22228c.png?resizew=157)
(1)证明:
;
(2)若
,求平面
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/0671b4776e142e17a79af5b3f0378ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607f6f66ca1cfc7887f7f4770fb921b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/204ffc27244d93a36696a938c1d85798.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/e5593516-4ec8-4873-87bd-fef44e22228c.png?resizew=157)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f7e8dd831f4edc711c0f7d5f078f625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
名校
【推荐3】如图,
是边长为3的正方形,平面
平面
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/3/31/2948258534473728/2948801476476928/STEM/d766f3fc-e453-4309-abf9-7691463c83bc.png?resizew=234)
(1)求证:面
面
;
(2)求直线
与平面
所成角的正弦值;
(3)在线段
上是否存在点
,使得平面
与平面
的夹角的大小为60°?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/9367449a5847eade07e69f4feddcb027.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d4ea87a0837c4eee99c8b5ba6ec977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1c122603b60b6f1a1334ddb56c3fb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3588f0a7c8e0862214ca93e6fbdf31ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0defcdbceec40fae6df761d542b71ca7.png)
![](https://img.xkw.com/dksih/QBM/2022/3/31/2948258534473728/2948801476476928/STEM/d766f3fc-e453-4309-abf9-7691463c83bc.png?resizew=234)
(1)求证:面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8dc6db50a9709c3f4d84eee7bdf1250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926584088b939200d88e64318f2d4e6c.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc839fc1b9a5e589de35cf43cb70e0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926584088b939200d88e64318f2d4e6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fb4fcf37d6353dd9e2c3cd3d2076c2.png)
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