如图,在四棱锥
中,侧面
底面
,底面
是平行四边形,
,
,
,
为
的中点,点
在线段
上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0434c0177ca5c88ec129bd4cc13f4a1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62526e69e7c4e59d9df8a5b2c2426400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692300f1ba0c83d7ffd4d0c6f36c9232.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
(Ⅰ)求证:;
(Ⅱ)当三棱锥的体积等于四棱锥
体积的
时,求
的值.
更新时间:2017-05-16 23:46:36
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,在△ABC中,已知
,
,
,BC边上的中线AM与
的角平分线
相交于点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/81c80dc0-8587-47de-942b-fc826544de1d.png?resizew=215)
(1)
的余弦值.
(2)求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1f4f255d191786f7d330d278868c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/81c80dc0-8587-47de-942b-fc826544de1d.png?resizew=215)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
(2)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3029ea5516e56e8d20594c71929624f.png)
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【推荐2】在
中,
,点
,
分别在线段
上,
.
(1)求
的值;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a355958abf7dc0f2eb949584cb87907b.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/fd6877751384616819a8ddeef96c4133.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2063dfb2f8709d598ae855f26befa42.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e2427ad045789944add7bcd6def487.png)
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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,在四棱锥
中,
,
,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/80212cec-d590-4a47-b533-696441d66afc.png?resizew=190)
(1)证明:平面
平面
;
(2)若平面
平面
,且
,三棱锥
的体积为1,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96c630b155517f1788d7b999cab2494d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77542024fabe20bd3e4cce840d98cb5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/80212cec-d590-4a47-b533-696441d66afc.png?resizew=190)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec43f7352b3a8c194b4c37485fb4ffd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f35614aff055b98b76ca262f64e629d.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80d7263b36bc05d3ef2082e482c4c479.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df5f4a4225ec86ff419be333c3161a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778ba4674ac8501397aea09be7453ba3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1083037647bea853ab5b73118f27ddd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】已知四边形ABCD为平行四边形,BC⊥平面ABE,AE⊥BE,BE =" BC" = 1,AE =
,M为线段AB的中点,N为线段DE的中点,P为线段AE的中点.
(1)求证:MN⊥EA;
(2)求四棱锥M – ADNP的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)求证:MN⊥EA;
(2)求四棱锥M – ADNP的体积.
![](https://img.xkw.com/dksih/QBM/2014/9/12/1571851507941376/1571851513856000/STEM/078b0761c35540588742bdc8b07714bc.png)
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解答题-证明题
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适中
(0.65)
【推荐1】如图,
和
所在平面垂直,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/5a5a0001-fd13-45f4-9ebe-2cba273b62ad.png?resizew=158)
(1)求证:
;
(2)若
,求平面
和平面
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/5a5a0001-fd13-45f4-9ebe-2cba273b62ad.png?resizew=158)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd15ead753cf2927f51d07c7727c6cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
解题方法
【推荐2】如图,在棱长为
的正方体
中,动点
在线段
上运动.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/7c10cffd-9ff3-4a1e-a03a-456dacd7ba67.png?resizew=166)
(1)求证:
平面
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/7c10cffd-9ff3-4a1e-a03a-456dacd7ba67.png?resizew=166)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/565133e91e3ace2b2187cfc6f1db5be6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41c5102280e6ac830944d335e9a1f0f.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41c5102280e6ac830944d335e9a1f0f.png)
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