如图,在四棱锥
中,底面
为梯形,
,
,
,
平面
,
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625150503075840/1631419987632128/STEM/1c1382df-bb54-4762-b7c0-bf67b8c06f54.png)
(1)求证:
平面
;
(2)若
与平面
所成的角为
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.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/ce519312a849963b376c202c3f9d7cf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b547d886c528fa2c63016c217b8fb51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b301c74bfd4824215e12ce4504cfec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4d781525777c7b5284dffc70b2a28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef19f98e86ae7504671413780b3b1a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b3038b3822fa224b2984bc423d2ad0a.png)
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625150503075840/1631419987632128/STEM/1c1382df-bb54-4762-b7c0-bf67b8c06f54.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36222db36e348661eb5f616820e4e60f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a74bf82d6c7d1568a33e1c135faa5b54.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
16-17高三下·浙江·阶段练习 查看更多[4]
2017届浙江省名校协作体高三下学期考试数学试卷2019年浙江省台州五校联考高三上学期阶段性考试数学试题浙江省宁波市九校2019-2020学年高二上学期期末联考数学试题(已下线)【新东方】杭州新东方高中数学试卷343
更新时间:2017-02-25 08:35:22
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【推荐1】如图,两条笔直的公路相交成60°角,两辆汽车A和B同时从交点O出发,分别沿两条公路行驶.如果汽车A的速度是48km/h,那么汽车B应以多大的速度行驶,才能使这两辆汽车在出发1h后相距43km(结果精确到1km/h)?
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【推荐2】已知函数
.
(1)求
的最小正周期及单调增区间;
(2)在
中,角A,B,C的对边分别为a,b,c若
,
,
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c8710b0123eb0e23c27ed9c68905e76.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45c1c08311fa7eebd8705883cc3917.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f002f960ec07ea229ed243e2d991d83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4a93c05337d718428222cced9e91d06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐3】设函数
.
(1)求函数
的单调递增区间;
(2)
,
,
分别为
内角
,
,
的对边,已知
,
,
的面积为
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f36fb22cff89eea45f75db4af221615.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d3c28e2fc237e76e757b8a82c619802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解题方法
【推荐1】如图,在四棱锥
中,
,
是边长为
的正三角形,平面
平面
,
,点
,
,
分别是线段
,
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/d6b27c4c-0e3e-468f-b0b5-e3b6ab241445.png?resizew=193)
(1)求证:点
在平面
内;
(2)若
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d452a7b850cd3a15b23619ad39bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb99353e3076643c832c8973ac8a6c1.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/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/d6b27c4c-0e3e-468f-b0b5-e3b6ab241445.png?resizew=193)
(1)求证:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e375fa6cd4a05814744169b157686077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8504651146697b0ecca4f789790d41ed.png)
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【推荐2】如图,在四棱锥
中,
平面ABCD,
,
,
,点E为棱PD的中点.
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893674172907520/2894437432475648/STEM/877b264c-fdca-421d-bed8-d46e3d1263ca.png?resizew=207)
(1)求证:
平面PAB;
(2)求证:
平面PAB.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e839ac941e8bf536ff35a12e56c7a400.png)
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893674172907520/2894437432475648/STEM/877b264c-fdca-421d-bed8-d46e3d1263ca.png?resizew=207)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58a20ea69475dcf57a5ff18c13eceaaa.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
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【推荐1】如图,在多面体ABC—DEF中,若AB//DE,BC//EF.
(1)求证:平面ABC//平面DEF;
(2)已知
是二面角C-AD-E的平面角.求证:平面ABC
平面DABE.
(1)求证:平面ABC//平面DEF;
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://img.xkw.com/dksih/QBM/2018/6/12/1965789732995072/1968455994777600/STEM/ad1a8f0bb9a14b8f87764d891c58a051.png?resizew=197)
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【推荐2】在正方体
中,过
,B,D三个点作一个平面,请画出二面角
的平面角,并说明画图的根据.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbb8ad11e4c9f36d02ff1b6405ddd70a.png)
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【推荐3】在我国古代数学名著《九章算术》中将由四个直角三角形组成的四面体称为“鳖臑”.已知三棱锥P-ABC中,PA⊥平面ABC.
(2)已知三棱锥P-ABC是一个“鳖臑”,且AC=1,AB=2,∠BAC=60°.
①若△PAC上有一点D,如图1所示,试在平面PAC内作出一条过点D的直线l,使得l与BD垂直,说明作法,并给予证明;
②若点D在线段PC上,点E在线段PB上,如图2所示,且PB⊥平面EDA,证明∠EAB是平面EAD与平面BAC的二面角的平面角.
(2)已知三棱锥P-ABC是一个“鳖臑”,且AC=1,AB=2,∠BAC=60°.
①若△PAC上有一点D,如图1所示,试在平面PAC内作出一条过点D的直线l,使得l与BD垂直,说明作法,并给予证明;
②若点D在线段PC上,点E在线段PB上,如图2所示,且PB⊥平面EDA,证明∠EAB是平面EAD与平面BAC的二面角的平面角.
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