1 . 如图所示的几何体ABCDFE中,△ABC,△DFE都是等边三角形,且所在平面平行,四边形BCED是边长为2的正方形,且所在平面垂直于平面ABC.
![](https://img.xkw.com/dksih/QBM/2014/1/6/1571462860136448/1571462865764352/STEM/dca127e10c074e7db1ab85a43b4b65a9.png)
(Ⅰ)求几何体ABCDFE的体积;
(Ⅱ)证明:平面ADE∥平面BCF;
![](https://img.xkw.com/dksih/QBM/2014/1/6/1571462860136448/1571462865764352/STEM/dca127e10c074e7db1ab85a43b4b65a9.png)
(Ⅰ)求几何体ABCDFE的体积;
(Ⅱ)证明:平面ADE∥平面BCF;
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2013·江西南昌·二模
2 . 如图,正三棱柱
中,侧面
是边长为2的正方形,
是
的中点,
在棱
上.
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571193677815808/1571193683607552/STEM/f78e823629d6490a94f0753afe383d08.png)
(1)当
时,求三棱锥
的体积.
(2)当点
使得
最小时,判断直线
与
是否垂直,并证明结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571193677815808/1571193683607552/STEM/f78e823629d6490a94f0753afe383d08.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7063564b091016afbc0303c1a000c399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6964cf370047153c3a3b705a8c7fb3b.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73fbd9444f237c202a0ed72afbd6e8d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f35f348ed8a1690d3ed02aa64459ca50.png)
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3 . 如图1,在边长为1的等边三角形ABC中,D,E分别是AB,AC上的点,AD=AE,F是BC的中点,AF与DE交于点G.将△ABF沿AF折起,得到如图2所示的三棱锥ABCF,其中BC=
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/4f471136-2f3f-43cc-996c-6b3e6755dbd5.png?resizew=319)
(1)证明:DE∥平面BCF;
(2)证明:CF⊥平面ABF;
(3)当AD=
时,求三棱锥FDEG的体积VFDEG.
![](https://img.xkw.com/dksih/QBM/2018/2/6/1876381238394880/1878493196951552/STEM/448741f34a8a4840b584b31d6c950569.png?resizew=17)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/4f471136-2f3f-43cc-996c-6b3e6755dbd5.png?resizew=319)
(1)证明:DE∥平面BCF;
(2)证明:CF⊥平面ABF;
(3)当AD=
![](https://img.xkw.com/dksih/QBM/2018/2/6/1876381238394880/1878493196951552/STEM/8a9f121d3caf4f9fae32c3a5f1e6631b.png?resizew=7)
您最近一年使用:0次
2017-02-08更新
|
711次组卷
|
3卷引用:2016-2017学年湖北宜昌葛洲坝中学高二文上期中数学试卷
4 . 如图所示,正三棱柱
中,
,
分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/7/a499f8db-5a49-4165-9c22-ce4187948540.png?resizew=176)
(1)证明:平面
平面
;
(2)若该三棱柱所有的棱长均为2,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/7/a499f8db-5a49-4165-9c22-ce4187948540.png?resizew=176)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6501f1c913a4ef64957a2f01ab5baa15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f96c673a2381f118ea2d3efc0bca1f3.png)
(2)若该三棱柱所有的棱长均为2,求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/499b4619511ea9fb89a7bdf8d8fb20fa.png)
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5 . 如图,设四棱锥
的底面为菱形,且
.
![](https://img.xkw.com/dksih/QBM/2016/9/25/1573039501918208/1573039508103168/STEM/c62561cb-bdb6-4b24-8b79-7ae5233c0e8a.png?resizew=225)
(1)证明:平面
平面
;
(2)求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc36e0463056bc2dc03e3b79e00f17e.png)
![](https://img.xkw.com/dksih/QBM/2016/9/25/1573039501918208/1573039508103168/STEM/c62561cb-bdb6-4b24-8b79-7ae5233c0e8a.png?resizew=225)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bde1e200d1dd5ddc433c876c9d2f688c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
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2016-12-04更新
|
825次组卷
|
4卷引用:2015届辽宁省沈阳市高中三年级教学质量监测一文科数学试卷
6 . 如图,已知正方体
的棱长为3,
,
分别是棱
,
上的点,且
.
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572108830924800/1572108837060608/STEM/1d7967ecc7084ad78b85e40286e7d60a.png?resizew=231)
(1)证明:
,
,
,
四点共面;
(2)平面
将此正方体分为两部分,求这两部分的体积之比.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f6915161f031acb190ef16044d76b1.png)
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572108830924800/1572108837060608/STEM/1d7967ecc7084ad78b85e40286e7d60a.png?resizew=231)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
(2)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00615fafac0175b97a8e4ed2b3b5c92f.png)
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7 . 已知等腰梯形PDCB中,PB=3,DC=1,PD=BC=
,A为PB边上一点,且PA=1,将△PAD沿AD折起,使面PAD⊥面ABCD.
(Ⅰ)证明:平面PAD⊥平面PCD;
(Ⅱ)试在棱PB上确定一点M,使截面AMC把几何体分成的两部分,且
.
![](https://img.xkw.com/dksih/QBM/2012/4/27/1570845937164288/1570845942759424/STEM/0acb8d1d106b48ff877cceb4c93641f2.png?resizew=184)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e051d14fd6a787387995331f5e6d026.png)
(Ⅰ)证明:平面PAD⊥平面PCD;
(Ⅱ)试在棱PB上确定一点M,使截面AMC把几何体分成的两部分,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819569f790173ca34f2bce0061a70bc6.png)
![](https://img.xkw.com/dksih/QBM/2012/4/27/1570845937164288/1570845942759424/STEM/0acb8d1d106b48ff877cceb4c93641f2.png?resizew=184)
![](https://img.xkw.com/dksih/QBM/2012/4/27/1570845937164288/1570845942759424/STEM/ee90b4b76662474bb7579bba593f4990.png?resizew=163)
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