如图,在四棱锥
中,四边形
是菱形,
,E是
的中点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/f2932a98-7a28-4134-a713-9951e887e1de.png?resizew=230)
(1)证明:
平面
.
(2)若
,且
,求四棱锥
的体积.
![](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/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba11242dcc61d3c7c3555b598b5fdc89.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/f2932a98-7a28-4134-a713-9951e887e1de.png?resizew=230)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b77c7356858bc40edc0b07b2f684f04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070bc896d35495237fd65576e9b6f88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
更新时间:2022-04-08 19:05:14
|
相似题推荐
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,在三棱柱
中,
,
,
,D为AB的中点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/33773552-8977-480d-a1e7-c83ec1dd6471.png?resizew=161)
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82343ddf8316e0a9a50c21c422bdc930.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f32f651907d6c9001655481f79ebda84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3d5520be2c7ed4f4c8d1ca8270cb8a3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/33773552-8977-480d-a1e7-c83ec1dd6471.png?resizew=161)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb689000fa7a3b425be3196d8b0f32af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd209cc3f91b254f5ed934e89271e0e.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91d6c98b5ed325bea4a4897a60cb1c12.png)
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解答题-证明题
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适中
(0.65)
名校
【推荐2】如图,在三棱锥
中,平面
平面
,
为等腰直角三角形,其中
,
为
中点.
(1)证明:平面
平面
;
(2)已知
,二面角
的大小为
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829018a6ca0aff95d89e3f7cd943274e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed0ad6e27ea2d5d028f0f76043ccb1f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ddc76d96d6951ebfef3fe63892a1114.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850e76c9a5c40c2ce950fa4a45388710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/816b7f285cc55bbe5bf873538ba87230.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
真题
【推荐1】四面体
及其三视图如图所示,平行于棱
的平面分别交四面体的棱
于点
.
![](https://img.xkw.com/dksih/QBM/2014/6/23/1571791924559872/1571791930466304/STEM/e75e6771887b4a0ca0a40ec6078219b4.png)
(1)求四面体
的体积;
(2)证明:四边形
是矩形.
![](https://img.xkw.com/dksih/QBM/2014/6/23/1571791924559872/1571791930466304/STEM/c11c8ec8901047bfb28513231dfb97d1.png)
![](https://img.xkw.com/dksih/QBM/2014/6/23/1571791924559872/1571791930466304/STEM/0c2ab83522444ce6a250f32ed0777382.png)
![](https://img.xkw.com/dksih/QBM/2014/6/23/1571791924559872/1571791930466304/STEM/b75a0d3b5618401c8c42478f0501a328.png)
![](https://img.xkw.com/dksih/QBM/2014/6/23/1571791924559872/1571791930466304/STEM/0fccb83a14914aa4be421be96332c0a5.png)
![](https://img.xkw.com/dksih/QBM/2014/6/23/1571791924559872/1571791930466304/STEM/e75e6771887b4a0ca0a40ec6078219b4.png)
(1)求四面体
![](https://img.xkw.com/dksih/QBM/2014/6/23/1571791924559872/1571791930466304/STEM/c11c8ec8901047bfb28513231dfb97d1.png)
(2)证明:四边形
![](https://img.xkw.com/dksih/QBM/2014/6/23/1571791924559872/1571791930466304/STEM/4308da50ec7140919103d051b39fcbc7.png)
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解答题-作图题
|
适中
(0.65)
解题方法
【推荐2】长方体
中,
,
,
是上底面内的一点,经过点
在上底面内的一条直线
满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/eba592b9-6a0b-4672-8935-50556b4ca007.png?resizew=152)
(1)作出直线
,说明作法(不必说明理由);
(2)当
是
中点时,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d262480ffb55b7617f44b63f130c154a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba0c1611f2dc5ce8349b485bf6bf66ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/eba592b9-6a0b-4672-8935-50556b4ca007.png?resizew=152)
(1)作出直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa10a579055042cd2a163e7fe80e934c.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】如图,三棱柱
中,
,侧面
为矩形,
,二面角
的正切值为
.
(1)求侧棱
的长;
(2)侧棱
上是否存在点
,使得平面
与平面
所成的锐二面角的余弦值为
?若存在,判断
点的位置并证明;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c40bccd2075cf8504ddfe1d31d41b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc5b398965f6cefede6b94469b5b71d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/524931a902bacd35904905b0a12a947c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/13/151ce16b-f4e3-4048-b6ab-420aeffccfd0.png?resizew=172)
(1)求侧棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
(2)侧棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16be0d639969598b638d1b6170bd1689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b2215de6d4986954c95a5b711fd05aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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