如图,直三棱柱
的所有棱长均相等,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/0ec183de-53c9-46e2-93f3-d8f53e867669.png?resizew=130)
(1)证明:
;
(2)设
分别是棱
上的点,若点
在同一平面上,且
的面积是
的面积的
倍,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/0ec183de-53c9-46e2-93f3-d8f53e867669.png?resizew=130)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9959790095c938b094ddf5953d2b7d2b.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74deab31f48c443b1cc525e4d9689be1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c0a845e9a772c02b1e5b658b4b1f027.png)
2023·山西·模拟预测 查看更多[3]
更新时间:2023-04-02 21:19:21
|
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,底面ABCD为平行四边形,
,
,且
底面ABCD.
![](https://img.xkw.com/dksih/QBM/2021/11/24/2858369873215488/2859545591775232/STEM/49aae21e-e9b2-4c96-bf43-956fbbdc81f5.png?resizew=324)
(1)证明:平面
平面PBC;
(2)若Q为PC的中点,且
,
,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c4e4a162f12d12a082b8d8fdd1aeab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdfd547c5cb12488099645da9bce79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://img.xkw.com/dksih/QBM/2021/11/24/2858369873215488/2859545591775232/STEM/49aae21e-e9b2-4c96-bf43-956fbbdc81f5.png?resizew=324)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04c222223dae9ef27d4c132534d9848.png)
(2)若Q为PC的中点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/decd72d94efd3dcc854c34154e7a40f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4b4e098c6194f55462b24f552f5967.png)
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解题方法
【推荐2】如图,在三棱锥
中,
平面
,
,
,点M,N分别是
上的一点,且
.
![](https://img.xkw.com/dksih/QBM/2020/8/15/2528240295264256/2531127757185024/STEM/97d4a405ba51453bb3c97280f9cf6b25.png?resizew=158)
(1)求证:
;
(2)若
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a355958abf7dc0f2eb949584cb87907b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/375e440c79830e8b9bf94b669fce1ab4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47891397990336f55f96bd66d367758b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5636a5d85d711a337a8d9374c787f287.png)
![](https://img.xkw.com/dksih/QBM/2020/8/15/2528240295264256/2531127757185024/STEM/97d4a405ba51453bb3c97280f9cf6b25.png?resizew=158)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d7e56367ffbcd363e8734d9314750b5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200f24e682c93e02a87f3f9d57dc5d40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70db40c42655327adee01caedfc9d50c.png)
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【推荐1】如图,直三棱柱
的底面为等边三角形,
分别为
的中点.
(1)证明:
平面
;
(2)若三棱锥
的体积为
,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/e02f58ebcf9978ea2082c2edec204fb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a342dcdd9c5e6254941ef1703c1f0b5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/27c4bd7c-63f1-48e0-bd1d-69d882a7f416.png?resizew=130)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
(2)若三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c868ec5de0af022feee3eeb98e2c30ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18483c9c195ecd922772527fa85c0fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
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【推荐2】如图,四棱锥
的底面是矩形,平面
平面ABCD,M是棱PD上的动点,
是棱AB上的一点,且
.
;
(2)若直线MN与平面MBC所成角的正弦值是
,求点
的位置.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d452a7b850cd3a15b23619ad39bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a3efb43e274c6799df2e43ec94fdbd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66fae8e33cd86fa8dab72704eaafe1ba.png)
(2)若直线MN与平面MBC所成角的正弦值是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次
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解题方法
【推荐1】如图,在四棱锥
中,
底面
,四边形
是凸四边形,且
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/db8515b7-1d7c-481e-ac58-ab39e6ed81cd.png?resizew=130)
(1)证明:平面
平面
;
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.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/b00a76b40e3e0dd1ffb62160b2b99715.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ea82794c0cf262948c38aa776f4b059.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/db8515b7-1d7c-481e-ac58-ab39e6ed81cd.png?resizew=130)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
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【推荐2】如图,在正方体
中,E,F分别为AB,
的中点.
![](https://img.xkw.com/dksih/QBM/2022/5/6/2973651434037248/2977114941177856/STEM/466914f8-5097-4bc5-876e-738b61168c24.png?resizew=226)
(1)证明:
平面
;
(2)设平面
与平面
的交线为l,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://img.xkw.com/dksih/QBM/2022/5/6/2973651434037248/2977114941177856/STEM/466914f8-5097-4bc5-876e-738b61168c24.png?resizew=226)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
(2)设平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589c878e789e07e33d65c8a18cf2c58a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bba77c1751f5277b947efc9238f0bc80.png)
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【推荐3】如图,圆
的半径为
,
、
是圆
的两条互相垂直的直径,
为
的中点,
.将此图形沿着
折起,在翻折过程中,点
对应的点为
.
![](https://img.xkw.com/dksih/QBM/2021/3/7/2672963776921600/2672992952459264/STEM/467517dc-036d-4ce6-995a-3287e910a07f.png?resizew=518)
(1)证明:
;
(2)当
时,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd8a97f37156cec6592795da3941f87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://img.xkw.com/dksih/QBM/2021/3/7/2672963776921600/2672992952459264/STEM/467517dc-036d-4ce6-995a-3287e910a07f.png?resizew=518)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d2c127e203a0cf07921d8386902c6b.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a90d6f16f1bfa7a67ba5987f249ce6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/849e9b7d8884ce1dc513e882bc98fd61.png)
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