如图,菱形
与正三角形
的边长均为
,它们所在平面互相垂直,
平面
,
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/a3ee50ca-146b-4934-89c5-b8e178600494.png?resizew=180)
(1)求证:平面
平面
;
(2)若
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a36f7e5128bcf12583792fe8a4a4d8fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/a3ee50ca-146b-4934-89c5-b8e178600494.png?resizew=180)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42ce82a4c37365f2d4dea2c4ad2e3288.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae8768996ca9a0f2c5d9a19abbd54df.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d31430a87a688a727b86e4001dcb3e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/199098479c92e87304b91871172d46e0.png)
更新时间:2020-03-27 23:46:34
|
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,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/41f9a7ef-149b-4c1c-8f0c-7201486c2072.png?resizew=222)
(1)求证:
平面
;
(2)若
与
相交于点
,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/c8139d9fd5c670c91aa7dc485366dd1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85b14529dae45519dfc3e2ee365e7b4a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/41f9a7ef-149b-4c1c-8f0c-7201486c2072.png?resizew=222)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8197bf06d017950c85c3ba6a291c095e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
(2)若
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e7352150af92bb49e5e589f6f7498fc.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在四棱锥
中,侧面
是等边三角形,且平面
平面
、E为
的中点,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/cd2f7547-6b57-42e1-a98b-70f4b4e95a72.png?resizew=230)
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4ab7e657f01bdfa235f8c4d6681d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ad8d16722f5b9e7fd2602f14d5ffbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/cd2f7547-6b57-42e1-a98b-70f4b4e95a72.png?resizew=230)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/932a04304f2d4975955d4baabb2deeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d492a2248463e0c0199a25d0f76d23.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在四棱锥
中,底面
为直角梯形,
,
,平面
底面
,
为
的中点,
是棱
上的点,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/55da0b11-32b0-4816-aa07-1eed6604cb35.png?resizew=174)
(1)求证:平面
平面
;
(2)若
为棱
的中点,求异面直线
与
所成角的余弦值;
(3)若二面角
大小为
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b356d998fdb500b90cde0e316d7b6da0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f4a1dc86ec008a976874c72f84c45c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3686ba2753cca5dccff70abad106c17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f85cc3c715b38550a5a6d67a021b2b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b836d5ebe75d93b4f9cfea913beb6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f4a1dc86ec008a976874c72f84c45c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316ecb1589c3cc179e2f62507020771e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecfac8dafd800b1af4dc1ab93fe2ae25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d54cb2decd0d50d4031f7e7b7cb34fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50d07a95d6f448a7a43ad0b34548eb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4f8145a8456850da5fd061eac1576e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/464e8441e9ca727f8a21cbdf6a924353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88b5ad219cd9d410d00a2537a75f7d93.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/55da0b11-32b0-4816-aa07-1eed6604cb35.png?resizew=174)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a8a3c89eeaf994335405d12ae03edea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d007d2ad8212134e6e9ecad7282f29.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d54cb2decd0d50d4031f7e7b7cb34fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50d07a95d6f448a7a43ad0b34548eb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3633b163497f6c68260f011690fc5e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a406913361c7092c1d765a43767c11e.png)
(3)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a405652321a2a60c4558f5e39719906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e788f114eafda0bef86a97bada0d2923.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,AB为圆柱底面的直径,
是圆柱底面的内接正三角形,AP和DQ为圆柱的两条母线,若
.
![](https://img.xkw.com/dksih/QBM/2022/4/28/2968165379514368/2969191794081792/STEM/9d1b6f09-b0bd-4bb9-9b8b-d2c9287adaab.png?resizew=187)
(1)求证:平面
平面
;
(2)求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bfa3242965ce027bbef9168bfb73b8.png)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2968165379514368/2969191794081792/STEM/9d1b6f09-b0bd-4bb9-9b8b-d2c9287adaab.png?resizew=187)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92509bcbf16d220a9ff1f18b018e990e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532c7d9eb4015a630d0f2f5038991932.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb40d3df2d01b1e5fae20529ba1ddf5.png)
您最近一年使用:0次