如图所示的几何体
中,
,
,
,
平面
,
平面
,点
在线段
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/5e25eccc-8db3-4184-b0c4-a0fa74f01e8d.png?resizew=181)
(1)证明:
平面
;
(2)若点
为线段
的中点,且三棱锥
的体积为
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99da52604d90b4772725a2632a39dbb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/689c065652544780be8b33ae92cbb6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed04b01505bbd8a4ac0bc12e46f23bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89add161a52c0d2b92b751dd156c6850.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/5e25eccc-8db3-4184-b0c4-a0fa74f01e8d.png?resizew=181)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0edb1508fc95765f3bb316bcb5252d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b6e3f0518632294dc748ca9710d15b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
2020高三·全国·专题练习 查看更多[1]
(已下线)专题20+立体几何综合-2020年高考数学(文)母题题源解密(全国Ⅱ专版)
更新时间:2020-08-27 10:27:16
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在直角梯形中
,
,
,
,平面
平面
,平面
平面
,
,在线段
上取一点
(不含端点)使
,截面
交
于点
.
![](https://img.xkw.com/dksih/QBM/2018/2/12/1880588704022528/1882299820916736/STEM/671abf220ae4459b876d9d73072337d1.png?resizew=212)
(1)求证:
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3faa90e55e754db6e327ecdce8d5669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d262480ffb55b7617f44b63f130c154a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/877582b5387278008d14fe5932622fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8786d031668348e7a3d2a38d1901713.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea9e761d56d2fe8448b44f4ccd434627.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f166307ca3b86dbd71aed464c497c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2018/2/12/1880588704022528/1882299820916736/STEM/671abf220ae4459b876d9d73072337d1.png?resizew=212)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/451557ef624a9c142ebc5fa155e0e28b.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ca4fac49b2e1a8af49acc1a4fb28602.png)
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【推荐2】已知正方体
的棱长为
,点
、
、
分别为棱
、
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/304221e3-5c46-4caa-bf16-caa519ff3a41.png?resizew=180)
(1)求四面体
的体积;
(2)求二面角
平面角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/304221e3-5c46-4caa-bf16-caa519ff3a41.png?resizew=180)
(1)求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68ac02c2f91cadb1e328bc6ab9b9c491.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc741de0ca651a0f3ef1974c3bb52bb6.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,三棱柱
中,
,D是AC的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/28/208c0dd9-3c5d-42c3-9080-4e0df8422a71.png?resizew=165)
(1)证明:
⊥平面
;
(2)若点
到平面
的距离是棱长AB的
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53369fdb4a4e39bf0b6fea43cac91022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ed4b84d38a6c0916bc4ac92f011e8e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/28/208c0dd9-3c5d-42c3-9080-4e0df8422a71.png?resizew=165)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87cdc08e1c4a04a18d5ecea03393e36d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90bf62a5229257b6ed65f3a47873dd3.png)
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【推荐2】如图,在三棱锥S-ABC中,E是线段SB上的一点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/9b30d30a-7641-4dcd-815d-36e912929a20.png?resizew=139)
(1)证明:SA⊥平面ABC;
(2)若平面ACE⊥平面SBC,求直线SC与平面ACE所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbfaf7401d2e75e1a4486792f7bcfdfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bcc186a9b825f6c861f33b264bbd11c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/9b30d30a-7641-4dcd-815d-36e912929a20.png?resizew=139)
(1)证明:SA⊥平面ABC;
(2)若平面ACE⊥平面SBC,求直线SC与平面ACE所成角的大小.
您最近一年使用:0次