如图所示,在三棱柱
中,
,
,
,点
在平面ABC的射影为点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/9cd66033-d49e-4644-873a-324f053a64b9.png?resizew=195)
(1)求证:
;
(2)若点D在平面
上运动,求CD的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/898e0c67ae7c30089cd1dcd47acfa456.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/9cd66033-d49e-4644-873a-324f053a64b9.png?resizew=195)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/429228f882da65a8e0064c88d02b8e40.png)
(2)若点D在平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
21-22高三上·全国·阶段练习 查看更多[9]
华大新高考联盟2021-2022学年高三上学期1月教学质量测评文科数学试题(已下线)解密11 空间几何体(分层训练)-【高频考点解密】2022年高考数学二轮复习讲义+分层训练(新高考专用)(已下线)数学-2022届高三下学期开学摸底考试卷C(文科)(新课标专用)(已下线)专题20 立体几何中垂直问题的证明-【重难点突破】2021-2022学年高一数学常考题专练(人教A版2019必修第二册)安徽省合肥市第八中学2022届高三下学期最后一卷保温文科数学试题安徽省合肥市肥东县第二中学2022届高三下学期一模文科数学试题(已下线)第12练 空间直线、平面的垂直-2022年【暑假分层作业】高一数学(人教A版2019必修第二册)专题6.6 立体几何初步(能力提升卷)-2021-2022学年高一数学北师大版2019必修第二册湖北省武汉市华中师范大学第一附属中学2022届高三上学期元月调研文科数学试题
更新时间:2022-01-10 11:13:34
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图,在
中,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/5/0e2f09f1-7e63-4db1-9722-45950d0332cb.png?resizew=162)
(1)求![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa8789dc2754f640b694dbfa59934d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba03505a2ec6653c4a65830d61694c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35333abd7f02d663d15251bc5cbbf921.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/5/0e2f09f1-7e63-4db1-9722-45950d0332cb.png?resizew=162)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
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解题方法
【推荐2】在
中,
分别是
的对边,且
.
(1)求
的值;
(2)若
,
边上中线
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9c1e84aaa7e1b5c1283075b36c72fb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30c66f48de1ee6a5f8623447cd72a27.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f980511bebe15a406d3acce5ced059f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a333bd26b952ba43d2121587b91fbbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-证明题
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名校
解题方法
【推荐1】已知四棱锥
的底面是直角梯形,
,
,
底面
,且
,
点为
的中点.
![](https://img.xkw.com/dksih/QBM/2020/10/9/2567277733240832/2571511628570624/STEM/37eb785c160740eba8699be72a6d596b.png?resizew=235)
(1)求证:
平面
;
(2)求三棱锥M-BCD的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd8e727e4efc22b49649f71ae9c9d84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c800b6aabdc453e2c7e343061e9c6a78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27a1a561d91c764cdb5e84c957c95488.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2020/10/9/2567277733240832/2571511628570624/STEM/37eb785c160740eba8699be72a6d596b.png?resizew=235)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/982d01f052709b72afeaf1015fc7acc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求三棱锥M-BCD的体积.
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【推荐2】如图,在三棱锥
中,
,M为PB的中点,D为AB的中点,且
为正三角形
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/fb131d8d-cc97-4633-97c3-254774ba84c9.png?resizew=167)
(1)求证:
平面PAC
(2)若
,三棱锥
的体积为1,求点B到平面DCM的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9be272b16df732d93adc4d6cc5e266ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4b0c4b339f44bbac0e275eb0718234.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/fb131d8d-cc97-4633-97c3-254774ba84c9.png?resizew=167)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d3a44d5001ed4f043d1cf1e1842ee42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
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【推荐1】如图,在正方体
中,
分别是
的中点,
.
中点为
,求证:平面
∥平面
;
(2)求二面角
的大小;
(3)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b9b62ea88f3953f9010bcb685d3329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e7cd4f5704c11aa2ca75e4bdd346e2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcdb0295b373c6e306ca0dcf86f8b941.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfb3f0b5d8bf98eeff66f43b7dcbb4be.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a6d0c4c4c84fe4972164be2d535e918.png)
(3)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
名校
解题方法
【推荐2】如图,四边形
是平行四边形,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02645d70427d58d99f680848b541ae03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/224bc17ff7dfb19d7dad4407dd381c38.png)
.
![](https://img.xkw.com/dksih/QBM/2021/2/3/2650163336437760/2652322046943232/STEM/6a2a21a0-e44e-4e1d-a0da-6fc7d74ddb23.png)
(1)求证:
平面
;
(2)若三棱锥
的体积为
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02645d70427d58d99f680848b541ae03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/224bc17ff7dfb19d7dad4407dd381c38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b81ec2557e6b99351ece4d0b5f3e0a09.png)
![](https://img.xkw.com/dksih/QBM/2021/2/3/2650163336437760/2652322046943232/STEM/6a2a21a0-e44e-4e1d-a0da-6fc7d74ddb23.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f09ad78d4eccd1a9c9ccd3c4af79c79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec66c1d36c6c2be3d3fc4519dfca195e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18483c9c195ecd922772527fa85c0fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
您最近一年使用:0次
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适中
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【推荐1】如图,已知
为等腰梯形,
,
,
平面
,
.
;
(2)求二面角
的大小.
![](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/9eee296a7d9fba487f1485c61580196f.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/cf2e356de1dec9ce998366a1a35c0a9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e4b16c2c6c9bd089da78122e9d2511.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb7851bac6e137a2aabd6484076e4ae.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,在矩形
中,
,
为
的中点.以
为折痕把
折起,使点
到达点
的位置,且平面
平面
(如图).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/2b0764df-3014-4ea8-b022-6f62a4fcdd99.png?resizew=297)
(Ⅰ)求证:
平面
;
(Ⅱ)求证:
;
(Ⅲ)对于线段
上任意一点
,是否都有
成立?请证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6602a9e044cd0719f0380ae97aff6a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ae119c3aebd074e7d172542378dbe78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d413a6ac9654b7678f0c339dd454ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/164e1cc74e41a2a55d3767c006392bfd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/2b0764df-3014-4ea8-b022-6f62a4fcdd99.png?resizew=297)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41924e972a176b57ed6cf3595011a833.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4da035673ef0edcfae6b72fb5e5ba34a.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11330fb96575fd18b2a8085759a76d81.png)
(Ⅲ)对于线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30513ea48bc1ef3ae78adac83d894f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98333ce2f3bb79cc862a0fb6d785a821.png)
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【推荐3】如图所示的三棱柱ABC-A1B1C1中,棱AA1⊥底面A1B1C1,AB=AC=AA1,∠ABC=30°,M,N,D分别是A1B1,A1C1,BC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/3fb4775b-9e5c-462f-8fa0-b92b4f82ab8b.png?resizew=228)
(1)求证:MN⊥AD;
(2)求为二面角M-AD-N的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/3fb4775b-9e5c-462f-8fa0-b92b4f82ab8b.png?resizew=228)
(1)求证:MN⊥AD;
(2)求为二面角M-AD-N的余弦值.
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