如图,在四棱锥
中,平面
⊥平面
,F为BC的中点,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb13966abedf9755ce083019ae83d4f4.png)
![](https://img.xkw.com/dksih/QBM/2022/4/7/2953051728347136/2954641593286656/STEM/26b78ca2b893400d8f84b18236da9ffc.png?resizew=195)
(1)证明:
⊥平面
.
(2)若
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc655b4d76a5b4d74271082ced237657.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f56fe2c1064b804bb235fe72a4af288.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/247b838f89222eb2b270817b95b95f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb13966abedf9755ce083019ae83d4f4.png)
![](https://img.xkw.com/dksih/QBM/2022/4/7/2953051728347136/2954641593286656/STEM/26b78ca2b893400d8f84b18236da9ffc.png?resizew=195)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a0a1d797a3f2e3c782608ae17f3862.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d435a91c0447826d31158be0ce5a9e6d.png)
更新时间:2022-04-09 20:56:37
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图所示,正方形
与直角梯形
所在平面互相垂直,
,
,
.
(Ⅰ)求证:
平面
;
(Ⅱ)求证:
平面
;
(Ⅲ)求四面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b8146c573edc0c64ebbc17eb99a71e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15cd53fe7b73365723ce4789bb259d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85b14529dae45519dfc3e2ee365e7b4a.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81fa367ec317fe2a30142e1c30cce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
(Ⅲ)求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://img.xkw.com/dksih/QBM/2015/4/7/1572064132661248/1572064138608640/STEM/8b1deba6-d995-4d8e-a164-33553cb0ea04.png?resizew=183)
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解答题-问答题
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【推荐2】如图,在斜三棱柱
中,
,
,侧面
为菱形,且
,点D为棱
的中点,
,平面
平面
.
(1)若
,
,求三棱锥
的体积;
(2)设平面
与平面
的交线为l,求l与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/900e00a3609e6043af1034761d4d65f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a696a182fff038a86b2bbe8ca099442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/399de2503b8e9b3d6978e231cc1c5ff4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f96e23f7b5d3b1dcac47c19fd6da8860.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/25/dd309130-bf59-4113-93d5-5efa4d1248a4.png?resizew=190)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fd676c41d2d644928f014b0fea4689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d79e7020414add95907e061df505ef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1adf768489b3650ae0bd6cc16fb4baf.png)
(2)设平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62fd0b510920be6bc60d170c3ff3da3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
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【推荐1】如图,在以
、
、
、
、
、
为顶点的五面体中,平面
平面
,
,四边形
为平行四边形,且
.
![](https://img.xkw.com/dksih/QBM/2018/3/10/1899124200792064/1901476875059200/STEM/7617d4a6879940bea2df96dfb40a11be.png?resizew=185)
(1)求证:
;
(2)若
,
,直线
与平面
所成角为
,求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb5a68a008a22d5a8cea5fe8dcf31e10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc2e966f2ef9bf4ed54d00b9ad8c81f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d40978fbe52316daaaa6bdbb403fea0.png)
![](https://img.xkw.com/dksih/QBM/2018/3/10/1899124200792064/1901476875059200/STEM/7617d4a6879940bea2df96dfb40a11be.png?resizew=185)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c230b2139256d8e4a7f964ccc8136d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55dcbe075165566acf363cd199f07ba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f144992e1cbee34868abce1e5ad38c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.png)
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解答题-证明题
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【推荐2】如图,四边形ABCD是边长为4的菱形,∠BAD=60°,对角线AC与BD相交于点O,四边形ACFE为梯形,EF//AC,点E在平面ABCD上的射影为OA的中点,AE与平面ABCD所成角为45°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/de2149b4-1fed-492f-9d78-a588d113abf7.png?resizew=169)
(Ⅰ)求证:BD⊥平面ACF;
(Ⅱ)求平面DEF与平面ABCD所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/de2149b4-1fed-492f-9d78-a588d113abf7.png?resizew=169)
(Ⅰ)求证:BD⊥平面ACF;
(Ⅱ)求平面DEF与平面ABCD所成角的正弦值.
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
【推荐3】如图所示,在四棱锥
中,四边形
为菱形,
为正三角形,且
分别为
的中点,
平面
,
平面
.
(1)求证:
平面
;
(2)求
与平面
所成角的正弦值.
![](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/c6e2903ff33266528a7902ad51cf8d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea77ba313fcc751481ac1ca214df3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db807b09cc550f476b3f8fa0c6a14425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4739ad948445af72d585fe29c745929b.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
![](https://img.xkw.com/dksih/QBM/2017/10/12/1793869632806912/1794560300146688/STEM/8692a244-0c50-44a5-be0a-e906621edc98.png?resizew=276)
您最近一年使用:0次