如图,在三棱柱
中,平面
平面
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/18ba9222-50ce-4651-8754-f6df7e818674.png?resizew=223)
(1)证明:
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cdaadeae37736a1e6dd93fa1fe712f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d6e0b02ae8f2bd681b899adf0a87ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5653b96122e370f6d651eec807eca029.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/18ba9222-50ce-4651-8754-f6df7e818674.png?resizew=223)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d398c91159b9c48ac35a52cbe3336248.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2ac20af67f3e0891be3102d70557ba.png)
更新时间:2021-12-04 18:26:16
|
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,在四棱锥
中,平面
平面
,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/15/519ae26c-a2eb-44e2-ba8a-60eeef2efe3a.png?resizew=170)
(1)证明:
平面
;
(2)若
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e921f46d90e43f4517c55832b6280f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9b9bb0f509e6f3d30858efb217c1f5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/15/519ae26c-a2eb-44e2-ba8a-60eeef2efe3a.png?resizew=170)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e4d19bf237a6fca67e0d01a9ddb726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
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解答题-证明题
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适中
(0.65)
解题方法
【推荐2】如图,在三棱柱
中,平面
平面
,侧面
为菱形,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/24/3c88ec61-88d3-40ef-8856-b8c54936b7c9.png?resizew=181)
(1)证明:
;
(2)若
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e34345885421ac2f5aff094534cba5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/24/3c88ec61-88d3-40ef-8856-b8c54936b7c9.png?resizew=181)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ab9dcd6116087d8f6a933d17d815e58.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af260e0d98c95d1e092dc4c6d348e3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3625c3dc03287d1bf53966f7e319c867.png)
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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①,
的直径
,圆上两点
在直线
的两侧,且
,
,沿直线
将半圆
折起,使两个半圆所在的平面互相垂直(如图②),F为
的中点,E为
的中点.根据图②解答下列各题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/2d383a44-5f78-4a93-9072-204925de8396.png?resizew=333)
(1)求三棱锥
的体积;
(2)求证:
;
(3)在
上是否存在一点G,使得
平面
?若存在,试确定点G的位置;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e0b41cd45fba881194a02ec19bc26e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf468f5132e14ee1d8cc766808b11af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/2d383a44-5f78-4a93-9072-204925de8396.png?resizew=333)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d5df1495a37552e3cff5fc296e9a953.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbbce793c1c824ee06fcf7e916648f37.png)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a779876cdfb2c489ad0eaed0f73e6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
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解答题-证明题
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适中
(0.65)
【推荐1】如图,三棱柱中
,
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/2019/1/16/2120217129697280/2120610066669568/STEM/4e89269634304ca09ccce9d6702eebd1.png?resizew=207)
(1)求证:
;
(2)求直线
与平面
所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23e734a3b768fd7e422801704d4a7aeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://img.xkw.com/dksih/QBM/2019/1/16/2120217129697280/2120610066669568/STEM/4e89269634304ca09ccce9d6702eebd1.png?resizew=207)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1515a445310d259a080d02e16c2e58e.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b94e97d085cea077cb82a0b7d2f523e.png)
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【推荐2】如图,多面体
中,四边形
是正方形,四边形
为直角梯形,
,
,
,
为
上一点,且
.
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a685fd7539b94dcede33055ef3b0e340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02b1139e07e431b5d4276757b232bad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6bcf7a81baf90480b616b9a5fde3493.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f723850c512ee4df6ea48ff2c38ff6b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c16aa31938679a9ee9686ae46409b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cdec00111d2d349c34dd63184c752b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93cf663ee2bf1ac5c43f4306fa0cf250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/335187895f612ce811414cfbedf89467.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea525564975bca3c35b6ca1d89e0cd40.png)
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解答题-证明题
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名校
解题方法
【推荐1】如图,在四棱锥
ABCD中,
和
都是等边三角形,平面PAD
平面ABCD,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/67a7ea17-3650-41b8-b52d-278c76d6afda.png?resizew=197)
(1)求证:CD
PA;
(2)E,F分别是棱PA,AD上的点,当平面BEF//平面PCD时,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f93c78e3b6ab0daa88d8306b2b2058b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e2903ff33266528a7902ad51cf8d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df6d51738ac1bc8b9530ea4a55745c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/585288e61871608f6ff8f7e4a0beafbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffc2817fa590affb5a760a25dc65308.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/67a7ea17-3650-41b8-b52d-278c76d6afda.png?resizew=197)
(1)求证:CD
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
(2)E,F分别是棱PA,AD上的点,当平面BEF//平面PCD时,求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f14baced26bcb4ec709a063a73d97c.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图1,在四边形
中,
.将
沿
翻折到
的位置,使得平面
平面
,如图2所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/74f12a5a-3f51-4182-a805-c22debe51a4b.png?resizew=367)
(1)设平面
与平面
的交线为
,证明:
.
(2)若点
在线段
上(点
不与端点重合),平面
与平面
夹角的正弦值为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0902a89ba9ad6ad425c3c0e2c312f39e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e9cc4de98250bee5e6bd85c1c1ba17b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db173e9c49d78248be0ef5d4aa7ba4fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4864c21e9664fa9111ede6425b09563a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/74f12a5a-3f51-4182-a805-c22debe51a4b.png?resizew=367)
(1)设平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c550269f3199038726f55cbd281c13a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/303e929bd26bfea47c42dcacac359aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa145a3e4f18f784ddf4869e0bf904c5.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350e954f629c1901a5cec03558319e46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5000fea066102e62cf2128ccbbd2b3e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faa00709db52164ca2d290e55b4dbc0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71288fd7699160c2624fbc8d6e0123f3.png)
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解答题-证明题
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适中
(0.65)
名校
【推荐3】如图
,梯形
中,
,
,
,将
沿对角线
翻折,使点
至点
,且使平面
平面
,如图
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/5c74b552-f0ed-4e42-8e09-0b13aec64bab.png?resizew=413)
(1)求证:
;
(2)连接
,当四面体
体积最大时,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/5c74b552-f0ed-4e42-8e09-0b13aec64bab.png?resizew=413)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b44f4120c94cb7176dc31fcac387b32e.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8922620e649f55d79118cbabf947a8fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02535e1a690ca111ca7a395a1bf48080.png)
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