如图,在三棱柱
中,
是等边三角形,
平面
是
的中点,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/94115467-6626-4807-8da4-e06e67258e60.png?resizew=136)
(1)求证:
平面
;
(2)求证:平面
平面
;
(3)若
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27d2f4ba57db33b30f6b948278292602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/94115467-6626-4807-8da4-e06e67258e60.png?resizew=136)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94270844f197d524bf1da4f1385befd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b43cbc92b5f5c26c7f70b52b27616a81.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcadc521b53fabecc10ed30fe8d96c2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d927585a17c2e98ef7d5a9589a26ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05dc16fa358b0b27087ba766a7b1cd79.png)
更新时间:2019-10-21 16:33:08
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,PCBM是直角梯形,
,
,
,
,又
,
,
,且直线AM与直线PC所成的角为60°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/7570a4f4-1491-4131-8a14-b1c240b1e7d3.png?resizew=244)
(1)求证:平面PAC⊥平面ABC;
(2)求异面直线PA与MB所成角的余弦值;
(3)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8432a44f6c6b37f4961dc63521fa7f9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3624d307a5482ff913eb8d608d827077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dca0fddd44a2a325754baf9452fe90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1be17e0a3e51cde1f50f384198e71e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bafa8c14100a4f847b41b9148954116c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/7570a4f4-1491-4131-8a14-b1c240b1e7d3.png?resizew=244)
(1)求证:平面PAC⊥平面ABC;
(2)求异面直线PA与MB所成角的余弦值;
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/142ea3931dc45cfe66b66ef17d3cefcd.png)
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解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,六面体
中,平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/c7aa7474-a02a-4d64-bfe4-1e3f846e5897.png?resizew=240)
(1)求证:
;
(2)若
,平面
平面
,
,
,
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a0c3a4e61b97fa9bc58f3179fc2958.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04de6e3d84ddf7da3dc4fab26e59df46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/c7aa7474-a02a-4d64-bfe4-1e3f846e5897.png?resizew=240)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab79d395d5aa7500d0606dd94b6319ff.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bce726bceb02452bb4e5ed6b00fa94e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a5628323a7eeb11213df5c9048b3543.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb3ce43d216ad9d22ccfa0ec656266ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/940078c89bad1724a5d7006a54755398.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53509459aad2e9f59f412f43b6f775d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d31815b1f3bcb36edacb318c198f41d4.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
【推荐1】如图所示,三棱柱A1B1C1—ABC的三视图中,正(主)视图和侧(左)视图是全等的矩形,俯视图是等腰直角三角形,点M是A1B1的中点.
![](https://img.xkw.com/dksih/QBM/2013/4/2/1571172784332800/1571172790075392/STEM/8df38c248b8c4b51a6fe02949dad2a67.png)
(1)求证:B1C∥平面AC1M;
(2)求证:平面AC1M⊥平面AA1B1B.
![](https://img.xkw.com/dksih/QBM/2013/4/2/1571172784332800/1571172790075392/STEM/8df38c248b8c4b51a6fe02949dad2a67.png)
(1)求证:B1C∥平面AC1M;
(2)求证:平面AC1M⊥平面AA1B1B.
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解答题-证明题
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适中
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解题方法
【推荐2】三棱台
中,
,平面
平面ABC,
,
与
交于D.
(1)证明:
平面
;
(2)求异面直线
与DE的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/976a71549531461110dae48b0595f67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce04b35c265cc9c48b60204bd2f718ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/793b4f1d99551a983ccaa8e5631cf997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/1/c39440e6-7d47-45ad-a8a9-936c70e0a0cb.png?resizew=192)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75aea24647cd4d0b4b9aa513bf5457b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,
,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/14cade6f-6f20-4ed6-bf3a-c56bcc747f9e.png?resizew=117)
(1)求证:平面
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50e7fab1b528527409b0aff8b14b250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96a9394f4b28f399fc860cb6f91ca2a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/954b08f41f3715c9b2743e73de7eb840.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b249b5dde4207aa7df5914a63bebd74.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/14cade6f-6f20-4ed6-bf3a-c56bcc747f9e.png?resizew=117)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db15a82520550a563d9c56ecf51971d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02864602e30b261c2de2fffb52193a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da4c2e7891137ecd46a7658f42b64a2.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】在四棱锥
中,底面
是边长为
的菱形,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/3/14/2677892602937344/2682504799928320/STEM/8c91fe10-0345-44c4-8196-5fec5b4b16c1.png)
(Ⅰ)证明:平面
平面
;
(Ⅱ)
为
的中点,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/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05740f0c6071846227dc0ec177ad15e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83640592853a53872d7af69c0cffc1bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e4d19bf237a6fca67e0d01a9ddb726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2899e607479d8d1c47d954ae9ebb7144.png)
![](https://img.xkw.com/dksih/QBM/2021/3/14/2677892602937344/2682504799928320/STEM/8c91fe10-0345-44c4-8196-5fec5b4b16c1.png)
(Ⅰ)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(Ⅱ)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae2ccd2a1b3571ff3db88ed8219f848.png)
您最近一年使用:0次