在如图所示的几何体
中,四边形
是边长为
的菱形,
,
平面
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2018/8/27/2019300655833088/2021488773103616/STEM/1b77f5c64a5a4fa3a0957f631d88d6aa.png?resizew=175)
(1)求证:
平面
;
(2)若几何体
的体积为
,求线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b3bb267e53073003778ed67bbbe531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d8408d4c93638b75f6481c11eb43d12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2018/8/27/2019300655833088/2021488773103616/STEM/1b77f5c64a5a4fa3a0957f631d88d6aa.png?resizew=175)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06fb58b1f186b54fd5709d61c7302ff4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若几何体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e7dc603317eb90974c75efec9f02b1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
更新时间:2018-08-30 11:12:20
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,在几何体
中,
平面
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/210542ba-e075-4461-acea-902c79862463.png?resizew=168)
(1)证明:平面
平面
;
(2)若
,
,三棱锥
的体积为
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e839ac941e8bf536ff35a12e56c7a400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3d2d3643a9579f2c693ef86909441e2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/210542ba-e075-4461-acea-902c79862463.png?resizew=168)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d7c88c481a78a38809b3abfe64c8d7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f332555e65843f32f4c623098c6adc72.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/338c6c83ab4abc895ac36ab888a55be6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f332555e65843f32f4c623098c6adc72.png)
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【推荐2】如图所示,在边长为a正方体
中,
分别为棱
的中点.
![](https://img.xkw.com/dksih/QBM/2018/10/22/2058996036788224/2061816401215488/STEM/691b0b0cd4a046de9aeded9bef0987e5.png?resizew=246)
(1)求证:点
四点共面;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c2d86d8daea5e652d99fe1c6bc3f9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff3147f4dce48df80779e0da83e9d0b3.png)
![](https://img.xkw.com/dksih/QBM/2018/10/22/2058996036788224/2061816401215488/STEM/691b0b0cd4a046de9aeded9bef0987e5.png?resizew=246)
(1)求证:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c2d86d8daea5e652d99fe1c6bc3f9a.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8511a1b768df56495af12fc303f869dd.png)
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解题方法
【推荐1】如图,在四棱锥
中,侧棱
底面
,底面
是菱形,且
,点
是侧棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/4053add0-375e-4d1b-902c-011445c3c245.png?resizew=158)
(1)求证:直线
平面
;
(2)若
,三棱锥
的体积是
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6be2b61f4a38e2ee2c1a01e00b3ae6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afb18c7c5391647214d4da31a88202d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7934e2543304fa29d2cc1ccfbc8daf5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a28be4d5a16cf245f6fa7c4088fee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/4053add0-375e-4d1b-902c-011445c3c245.png?resizew=158)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/954c584f9c868d235e0fc1debb14428d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7f2e778c348154f5b27aa6e074fe45d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b994a51de39375493cf5d7f1827ea9b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71224c66874511b50b84efcbeef1be76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63df78dd883e274ecf7d4017ef5efcdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
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解题方法
【推荐2】如图,三棱锥
中,平面
平面
,点
在线段
上,且
,点
在线段
上,且
平面
.
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844851946840064/2850376136589312/STEM/e92562356abe4ad79039ead9eb5ddf0b.png?resizew=285)
(1)证明:
平面
;
(2)若四棱锥
的体积为7,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42deb6707a04e7810c10a8370f2422d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93eb64abcc57d57256902c99f071b751.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844851946840064/2850376136589312/STEM/e92562356abe4ad79039ead9eb5ddf0b.png?resizew=285)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d246f9eceab371ebf47a47c2f11a4ad.png)
(2)若四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ac49e2f895d4667404c1e648fa70dac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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解题方法
【推荐1】如图,在四棱锥P﹣ABCD中,PA⊥平面ABCD,底面ABCD是菱形,点O是对角线AC与BD的交点,M是PD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/cae78655-4c70-440a-aec0-c4c764882401.png?resizew=169)
(1)求证:OM∥平面PAB;
(2)求证:平面PBD⊥平面PAC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/cae78655-4c70-440a-aec0-c4c764882401.png?resizew=169)
(1)求证:OM∥平面PAB;
(2)求证:平面PBD⊥平面PAC.
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【推荐2】如图,三棱柱
的所有棱长都是
,
平面
,
为
的中点,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2022/1/17/2896654029594624/2897194226999296/STEM/49cc372b-1075-4bfe-80e2-9bebbf205e65.png?resizew=202)
(1)证明:直线
平面
;
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/2022/1/17/2896654029594624/2897194226999296/STEM/49cc372b-1075-4bfe-80e2-9bebbf205e65.png?resizew=202)
(1)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
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【推荐3】在正三棱柱ABC-A1B1C1中,AB=2,AA1=3,点D为BC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/0f591a8c-ff77-4784-a459-027cad37898c.png?resizew=134)
(1)求证:A1B∥平面AC1D;
(2)在线段A1C上是否存在一点E,使平面EAD与平面CAD的夹角的余弦值为
?若存在,指出点E的位置;若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/0f591a8c-ff77-4784-a459-027cad37898c.png?resizew=134)
(1)求证:A1B∥平面AC1D;
(2)在线段A1C上是否存在一点E,使平面EAD与平面CAD的夹角的余弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bc4cbe1fa83a288d069935ef4908a2b.png)
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