如图,在长方体
中,底面四边形
是正方形.
![](https://img.xkw.com/dksih/QBM/2022/9/3/3058467042279424/3060523932844032/STEM/014cb6eb998b4e86891b095a2576c4e7.png?resizew=167)
(1)求证:
平面
;
(2)若
,求几何体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2022/9/3/3058467042279424/3060523932844032/STEM/014cb6eb998b4e86891b095a2576c4e7.png?resizew=167)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b4cd2b33bd983a9ed6575b9de04a46a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/622a61b260c96966e2527e346f4288ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a736592053ca39e373bd9ff417c77c.png)
更新时间:2022-09-06 11:14:47
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相似题推荐
解答题-问答题
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解题方法
【推荐1】阿基米德是伟大的古希腊数学家,他和高斯、牛顿并称为世界三大数学家.他的一个重要数学成就是“圆柱容球”定理:即在带盖子的圆柱形容器(容器的厚度忽略不计)里放一个球,该球与圆柱形容器的两个底面和侧面都相切,则球的体积是圆柱形容器的容积的
,并且球的表面积也是圆柱形容器的表面积的
.求该圆柱形容器的容积与它的外接球的体积之比.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
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解题方法
【推荐2】在三棱柱
中,侧棱
底面
,
为
的中点,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/b1720cb9-1525-431d-8939-8d3ba8dced23.png?resizew=170)
(1)求证:
平面
;
(2)求多面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d25e8fc3dda4f8b45491514b6e22a962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24b8173115f2297bc4c85bf7325fbef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/387652f6c194e82abdab04bcfaa395ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19c3a12739d31f55a8ca8590e1f1f5d1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/b1720cb9-1525-431d-8939-8d3ba8dced23.png?resizew=170)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1c920d02068d0e63ffdab70786c526d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf9628142422a4884bd59538da6d312.png)
(2)求多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dbd8fd4aa7a183c47029d16537ef1e9.png)
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解题方法
【推荐1】已知四棱锥
的高为
,底面
是直角梯形,其中
,
,
,
为边
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/e783ad71-d0f7-444e-8e8b-63a937a63ddc.png?resizew=187)
(1)证明:
平面
;
(2)直线
上是否存在一点
,使得平面
平面
?请说明理由;
(3)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1074c943acd591413af464a28c285f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/e783ad71-d0f7-444e-8e8b-63a937a63ddc.png?resizew=187)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/932a04304f2d4975955d4baabb2deeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b9658dd92f4bc8ec3d68534e48e16a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d492a2248463e0c0199a25d0f76d23.png)
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【推荐2】在直三棱柱
中,
,
,D,E分别为棱
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/666a3b91-3331-4b75-9dd4-aa14859e2bce.png?resizew=166)
证明:
;
若
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80969d2b85b57d776a482dde2df0f5a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7453281856e27900d1d806e5eb6c3779.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2709579653c664848665368a0de143.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f9b20b9437f18cd394371fa6175d785.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/199e46b49066d0f055b0be2c0cf69e48.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/666a3b91-3331-4b75-9dd4-aa14859e2bce.png?resizew=166)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b50a8821abe8c62e4d77a99e58dbb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd3fe55d698c99b5049af72a202fe212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/064974722acce36ebc60bd28fda97256.png)
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【推荐1】如图,在直三棱柱
中,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/56ab7705-0112-4c76-98fb-5d2656f66139.png?resizew=123)
(1)证明:
;
(2)求二面角
的余弦值.
![](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/099edd3520292558184521a9af4e9064.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d261edf9b4cfa7232e2bc184db1995.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/56ab7705-0112-4c76-98fb-5d2656f66139.png?resizew=123)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/993830e5de2bbf858071d375bbf186f8.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b72e3ff46d4140c4a74c89adf5c2d259.png)
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【推荐2】如图,
为⊙O的直径,
垂直于⊙O所在的平面,M为圆周上任意一点,
⊥
,N为垂足.
⊥平面
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03203dd5ac79dd8c6707e4340773359.png)
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