如图所示,四棱锥
的底面
是平行四边形,
分别是棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/cccfeee3-4930-4f22-8cc4-f456800e75f8.png?resizew=179)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb986e3dee4aa65b92cda9b11c1b8e18.png)
平面
;
(2)若
,求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790e1f26a6b7010bab031c5bfc655c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b64b03bdd6fe567c99c15220aebbd63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98c16bb78f27578cedfb680bb19c97e8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/cccfeee3-4930-4f22-8cc4-f456800e75f8.png?resizew=179)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb986e3dee4aa65b92cda9b11c1b8e18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9e54073845d1ddb3526c9887524c197.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b6c9d7d62fe841774b87372a884a48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4294b7141d394654841008ac9b40dab.png)
更新时间:2022-10-07 20:06:53
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,在直三棱柱
中,
,
,M,N,P分别是
,BC,
的中点.
![](https://img.xkw.com/dksih/QBM/2021/12/20/2876594855100416/2946922761101312/STEM/38bc52aaf4f54ec1b245a1e37644ad27.png?resizew=253)
(1)证明:
平面
;
(2)求平面PMN与平面ABC所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90e17995e2f71e297d94ae51c7e5b1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://img.xkw.com/dksih/QBM/2021/12/20/2876594855100416/2946922761101312/STEM/38bc52aaf4f54ec1b245a1e37644ad27.png?resizew=253)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc027de6ca8c118ed6ccd52eae99a821.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
(2)求平面PMN与平面ABC所成锐二面角的余弦值.
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】已知正方形
的边长为1,
平面
,且
分别为
的中点,求直线
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374fe9986ebbc986fc422e514ab93a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d246f9eceab371ebf47a47c2f11a4ad.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】在正四棱柱
中,
,
分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/e16d4ffc-bb2b-4a93-b596-b4718c8ec1b1.png?resizew=131)
(1)求证:
平面
;
(2)若
,
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/e16d4ffc-bb2b-4a93-b596-b4718c8ec1b1.png?resizew=131)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a40d8806b86572352ed08aa2b7f89f7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f7e8dd831f4edc711c0f7d5f078f625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920afebdfaec5c13216348a34ac4b03e.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】在正三角形ABC中,E、F、P分别是AB、AC、BC边上的点,满足
(如图1).将
沿EF折起到
的位置,使二面角
成直二面角,连接A1B、A1P(如图2)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/b548b964-04cc-4f37-a113-79a18b165ac8.png?resizew=398)
(1)求证:
平面BEP;
(2)求直线A1E与平面A1BP所成角的大小;
(3)求二面角B﹣A1P﹣F的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c06ee44206d4e110610bc412f11f2ab5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb2d555062f34d5a74f6d47da4ea8888.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc14ed237a4bcc35cbd1f5f1321b3718.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/b548b964-04cc-4f37-a113-79a18b165ac8.png?resizew=398)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4525c00ed908bed8ba8d353e747a858.png)
(2)求直线A1E与平面A1BP所成角的大小;
(3)求二面角B﹣A1P﹣F的余弦值.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐2】在四棱柱
中,底面ABCD是菱形,且
.
(1)求证:平面
平面
;
(2)若
,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28af669cd49a1a5fc854e9d2495a5fa6.png)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba0fbd88fdb064072eedd136e9cb41ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc1c04946340198af69170d4ebd4b42.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8510133b8aca1b63b25a86ee39d5bf9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc2fe763308ef7daaaf5fb8b768450ed.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/7/31dd9dbd-74b1-4534-ac33-be585a647631.png?resizew=215)
您最近一年使用:0次