直三棱柱
中,
,
,
,点
、
分别为
和
的中点.
(1)证明:
平面
;
(2)求三棱锥
的体积(锥体体积公式
,其中
为底面面积,
为高)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71f2185273bf04c11118c7954f7ec822.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8e9ec412ea0355e4e5cd06c60e5fee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98e486a1aad96167ff62f6fb5136e0bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf42e1391da5b2a4d692140b9c95242e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a06faea49d957a5bab3fe0582f76ff23.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da1761eb53405d5012c232c0f8bc7d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f7309683ff41a94e5c5cfeabaeda52a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
更新时间:2017-10-13 21:14:04
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,菱形
与等边
所在的平面相互垂直,
,点E,F分别为PC和AB的中点.
(Ⅰ)求证:EF∥平面PAD
(Ⅱ)证明:
;
(Ⅲ)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fbc6fc08e561f12889bb52705581ba0.png)
(Ⅰ)求证:EF∥平面PAD
(Ⅱ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdfa54114f04a75b8c96165b3718ed7f.png)
(Ⅲ)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd0a275865e14038dcedb7fd78a994.png)
![](https://img.xkw.com/dksih/QBM/2018/1/2/1851598868439040/1853715746824192/STEM/dcb5db72b0f54831ac3c813365e3266f.png?resizew=212)
您最近一年使用:0次
解答题-证明题
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解题方法
【推荐2】四棱锥P-ABCD中,PC⊥平面ABCD,底面ABCD是等腰梯形,且
,
,
,
,M是棱PB的中点.
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be41b05e11ba5eadaaed9a224b949774.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0684e0b09b04661c602437982c0397.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9bad875ab4b5b8c707d452db4cabaa4.png)
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解答题-问答题
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名校
解题方法
【推荐3】如图,四棱锥
中,底面
是平行四边形,F是
的中点.
![](https://img.xkw.com/dksih/QBM/2022/4/21/2963078724108288/2963768550604800/STEM/badf09a9-3903-4c54-ae42-38a4a0a9e66a.png?resizew=198)
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
平面
;
(2)若
,求四棱锥
的体积.
![](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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2022/4/21/2963078724108288/2963768550604800/STEM/badf09a9-3903-4c54-ae42-38a4a0a9e66a.png?resizew=198)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae8768996ca9a0f2c5d9a19abbd54df.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52f22f1c7ff740dd3d53be84f14a122.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.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
解题方法
【推荐1】如图,
是平行四边形
所在平面外一点,
是
的中点.
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
(2)若
是
上异于
、
的点,连结
交
于
,连结
交
于
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30067b7b236d17af8a462f96a58d11bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8cbcfd989ba7aa3c455fcaecf175192.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2】如图,在四棱锥P-ABCD中,底面是直角梯形ABCD,其中AD⊥AB,CD
AB,AB=4,CD=2,侧面PAD是边长为2的等边三角形,且与底面ABCD垂直,E为PA的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/1/e0c661b6-9781-46de-aa86-307a99b2d7e5.png?resizew=187)
(Ⅰ)求证:DE
平面PBC;
(Ⅱ)求三棱锥A-PBC的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/1/e0c661b6-9781-46de-aa86-307a99b2d7e5.png?resizew=187)
(Ⅰ)求证:DE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
(Ⅱ)求三棱锥A-PBC的体积.
您最近一年使用:0次
解答题-证明题
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适中
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解题方法
【推荐3】如图,四棱锥
中,底面ABCD为菱形,
平面ABCD,BD交AC于点E,F是线段PC中点,G为线段EC中点.
Ⅰ
求证:
平面PBD;
Ⅱ
求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bba77c22664cbf2111ee2879bf944f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4d5332664bede4c408d3226c691ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a69bd75be59ed11e9d1feb582079d56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03e1d5a62f9a6b3e03dfe15a180a316f.png)
![](https://img.xkw.com/dksih/QBM/2019/4/10/2179305606447104/2179577889521664/STEM/8b0a62e7b79047719b3ea3f442f1b689.png?resizew=163)
您最近一年使用:0次