如图,四棱柱
中,![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/596f01c22a6b4791a2ec63bd661fd429.png)
底面
.四边形
为梯形,
,且
.过
三点的平面记为
,
与
的交点为
.
(1)证明:
为
的中点;
(2)求此四棱柱被平面
所分成上下两部分的体积之比;
(3)若![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/596f01c22a6b4791a2ec63bd661fd429.png)
,
,梯形
的面积为6,求平面
与底面
所成二面角大小.
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/2fc9ffddd0dd414bb43f277be481882c.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/596f01c22a6b4791a2ec63bd661fd429.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/8cadd2a06907476387af1fab080df0d7.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/260bdd891a01497cb1d5186c01a71651.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/260bdd891a01497cb1d5186c01a71651.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/450b8c92f03241108169cf1af53f4089.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/3add4f59a61140d398a6e8961ed10143.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/c39a275a980c48258e0a9f63850249da.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/04bb3358044143c0a7917a9aba6f5516.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/ad148f0a1a884d7fa7a86cdff63c5822.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/04bb3358044143c0a7917a9aba6f5516.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/613a5ceca8174a10b921e31320d10024.png)
(1)证明:
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/613a5ceca8174a10b921e31320d10024.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/ad148f0a1a884d7fa7a86cdff63c5822.png)
(2)求此四棱柱被平面
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/04bb3358044143c0a7917a9aba6f5516.png)
(3)若
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/596f01c22a6b4791a2ec63bd661fd429.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/cdfb0865f83a4b318854af80e2164293.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/e2a8ab04577541d9aa1dc7c2bcb8d83a.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/260bdd891a01497cb1d5186c01a71651.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/04bb3358044143c0a7917a9aba6f5516.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/260bdd891a01497cb1d5186c01a71651.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782443687936/1571782449627136/STEM/9dfed7d9-ea66-4a82-b56c-9c0ba6638f06.png?resizew=191)
更新时间:2016-12-03 02:22:29
|
相似题推荐
解答题-问答题
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适中
(0.65)
名校
【推荐1】如图,在直三棱柱
中,
是
的中点,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/ea88f3c0-6b29-4911-a682-d57b4e1be804.png?resizew=160)
(1)求异面直线
与
所成角的大小;
(2)若直三棱柱
的体积为
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f89fcd826d1a1cadf17e79c732ee1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/ea88f3c0-6b29-4911-a682-d57b4e1be804.png?resizew=160)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)若直三棱柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12c5abd786a6c29929c80374239ea0fd.png)
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解答题-问答题
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适中
(0.65)
解题方法
【推荐2】如图甲,在四边形ABCD中,
,
,
,
.将
与
沿AE,BF同侧折起,连接CD得到图乙的空间几何体
.
![](https://img.xkw.com/dksih/QBM/2020/12/16/2619050586947584/2654169739976704/STEM/5ddd90a4-b2a9-49eb-8c64-41f28eb1ef58.png?resizew=445)
(1)若
,证明:
;
(2)若
,
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180868535d96d800625148a03a33e9d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6180cb8ef486172669c7b7724fb27f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15bd5bf70253169de1becbeef5a00eaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff00441c41fc516c37876d266fcbc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/535770901287f244911b42412533d4a9.png)
![](https://img.xkw.com/dksih/QBM/2020/12/16/2619050586947584/2654169739976704/STEM/5ddd90a4-b2a9-49eb-8c64-41f28eb1ef58.png?resizew=445)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5322a78b02c2bc387ea7dce3e9461974.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dced11455b3e31a9090915f80a046fa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18120a244d3a1f9c1688bf53eb2ad775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26712d1a7a5864cd18498f16f7bd96c.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3】如图,在四棱锥
中,
平面
,底面
是菱形,且
,
,
,其中
,
为
与
的交点,
为棱
上一点.
![](https://img.xkw.com/dksih/QBM/2021/7/23/2770471288651776/2789436941107200/STEM/0c6f626222ba4cdda4a1d61fa357b22b.png?resizew=391)
(1)求证:平面
平面
;
(2)若
平面
,求三棱锥
的体积的最大值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.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/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4217f4375caaeef4d4221143d5f6bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecefc81daf4044d2d95bd16d05df7823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7326ea56be82bd616fec7e6aa3c884c8.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/2021/7/23/2770471288651776/2789436941107200/STEM/0c6f626222ba4cdda4a1d61fa357b22b.png?resizew=391)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/677d1863ff4d8ac1604b18149d4f320f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826bf6fa3706921b77ad0eb4fcc206bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b999123e51b75bfeea6bee373e1677e9.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,在四棱锥
中,
,
,
为棱
的中点,
,
.
![](https://img.xkw.com/dksih/QBM/2021/7/16/2765299886915584/2765338955661312/STEM/9bcc076e-48e5-40d7-ac69-4f264ece023c.png?resizew=290)
(1)求证:
平面
;
(2)若平面
平面
,
是线段
上的点,且
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bdb3995265a321989202ff01001013d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af620f6d204d310d8e3f267fdd6c3f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ca79bc7f4299dd8086a5f78bfca5cf2.png)
![](https://img.xkw.com/dksih/QBM/2021/7/16/2765299886915584/2765338955661312/STEM/9bcc076e-48e5-40d7-ac69-4f264ece023c.png?resizew=290)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3643175b4e5ea91235a276a9ba9291c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/198e68169f0fbd48ea05576f32914b5e.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,在平行六面体
中,底面
是菱形,四边形
是矩形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/564ec4c1-c0f2-45b2-a491-407ba9001514.png?resizew=201)
(1)求证:
;
(2)若
点
在棱
上,且
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bf9ef324f1289e205e29fed105c38e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/564ec4c1-c0f2-45b2-a491-407ba9001514.png?resizew=201)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/417104247ce266ae42c3a9860f387272.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61d13039125858b5d0685740505bf166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb45845b2259bb4d10a56f568554cb0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f388690d28808e81e3c3cedb1d1755fd.png)
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