在四棱锥
中,
平面
,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/1/25/2643792826482688/2645768979554304/STEM/fc20b485-faa4-4884-9023-1eab892c87f5.png?resizew=234)
(1)求证:
;
(2)当
时,求此四棱锥的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0094d7f0082284659eda005ef722580d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e2a44d05b1d387150c4b359e021ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffc2817fa590affb5a760a25dc65308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://img.xkw.com/dksih/QBM/2021/1/25/2643792826482688/2645768979554304/STEM/fc20b485-faa4-4884-9023-1eab892c87f5.png?resizew=234)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbd7c2767c106faf27d6a97ebc8e739.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cd5c4f8b106d01e0e431078e1a468b.png)
2015·海南·模拟预测 查看更多[3]
2015届海南省嘉积中学高三下学期第五次测试文科数学试卷(已下线)期末综合检测04-2020-2021学年高一数学下学期期末专项复习(苏教版2019必修第二册)内蒙古赤峰二中2020-2021学年高二上学期期末考试数学(文)试题
更新时间:2021-01-28 11:33:40
|
相似题推荐
解答题-问答题
|
较易
(0.85)
名校
【推荐1】在三棱柱
中,已知侧棱与底面垂直,∠CAB=90°,且AC=1,AB=2,E为BB1的中点,M为AC上一点,AM=
AC.
![](https://img.xkw.com/dksih/QBM/2021/1/6/2630467917291520/2631943177740288/STEM/39b280e34f5f40cd8875e72c0bfe6e1c.png?resizew=150)
(1)若三棱锥
的体积为
,求
的长;
(2)证明:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://img.xkw.com/dksih/QBM/2021/1/6/2630467917291520/2631943177740288/STEM/39b280e34f5f40cd8875e72c0bfe6e1c.png?resizew=150)
(1)若三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f5ac82002adf03463f753b9833e6579.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0467b0675c3ecfb282cc88255284d3e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53eec6b6fbd4e275f92828298a4bcfb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0685857389c8f5e388eed590b9b787ba.png)
您最近一年使用:0次
【推荐2】如图,长方体
中,
,
,
是线段
上的动点.
![](https://img.xkw.com/dksih/QBM/2021/7/12/2762685874192384/2764575223521280/STEM/b82ef096-2d03-4499-8195-1d751221c4b6.png?resizew=215)
(1)当
时,证明:平面
平面
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40465f935e4985ebd9fda16bcda24527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ac04ec6ef6ba466a8bed85a57654c9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2021/7/12/2762685874192384/2764575223521280/STEM/b82ef096-2d03-4499-8195-1d751221c4b6.png?resizew=215)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9277d1603a6e19a6536fb8b2e3246f0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30dd69d7e7ddac96481dcf44965ebe58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b94e97d085cea077cb82a0b7d2f523e.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
名校
解题方法
【推荐1】如图,在三棱柱
中侧棱垂直于底面,且
,点D是AB的中点.
![](https://img.xkw.com/dksih/QBM/2020/2/12/2397658758479872/2398744230510592/STEM/66f0db7319414fbfba0b8d56200feedc.png?resizew=255)
(1)求证:
;
(2)若
,
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://img.xkw.com/dksih/QBM/2020/2/12/2397658758479872/2398744230510592/STEM/66f0db7319414fbfba0b8d56200feedc.png?resizew=255)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/429228f882da65a8e0064c88d02b8e40.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19bc7774144c164f7ebaeca54fa657e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6964f7825bd9a590ce38faefff1326.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
解题方法
【推荐2】如图,AB是圆O的直径,点C是圆O上不同于A,B的一点,点V是圆O所在平面外一点.
![](https://img.xkw.com/dksih/QBM/2021/12/4/2865369064431616/2865915718713344/STEM/9de455577ca3469d97c145734d65fed8.png?resizew=185)
(1)若点E是AC的中点,求证:
平面
;
(2)若
,求证:
平面
.
![](https://img.xkw.com/dksih/QBM/2021/12/4/2865369064431616/2865915718713344/STEM/9de455577ca3469d97c145734d65fed8.png?resizew=185)
(1)若点E是AC的中点,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af142a6050b54e8b5777a085d4597481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af57d63e83ef0e183add10cd6beec65b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ddec9dcc57db89ccf21303f13fccda9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deae57d07054a06b33749895b1540b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
解题方法
【推荐1】已知正三棱柱底面边长为
,
是
上一点,
是以
为直角顶点的等腰直角三角形,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/1526c21f-7aa1-4e05-8f9c-0ffc31aa6422.png?resizew=139)
(1)证明:
是
的中点;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c21f920814c1c5e76d3f3b72bd22934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/1526c21f-7aa1-4e05-8f9c-0ffc31aa6422.png?resizew=139)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7abc9839172e487277e8105ad4cd4b2.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
解题方法
【推荐2】在四面体ABCD中,设AB⊥CD,AC⊥BD.求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/5/2c3e15b5-1cd0-480a-b254-5e77621e07af.png?resizew=158)
(1)AD⊥BC;
(2)点A在底面BCD上的射影是△BCD的垂心.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/5/2c3e15b5-1cd0-480a-b254-5e77621e07af.png?resizew=158)
(1)AD⊥BC;
(2)点A在底面BCD上的射影是△BCD的垂心.
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
名校
【推荐3】如图,在四棱锥
中,四边形
为矩形,
平面
,
,
与平面
所成角为30°,
为
上一点且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/4e09e1bf-cc54-480c-aa50-108e162a8530.png?resizew=166)
(1)证明:
;
(2)设平面
与平面
的交线为
,在
上取点
使
,
为线段
上一动点,求平面
与平面
夹角的正弦值的最小值.
![](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/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5e84a62b385350e02a534046d6acf03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6be9f0a4775f2f15b4c9d412b52ede88.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/4e09e1bf-cc54-480c-aa50-108e162a8530.png?resizew=166)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a51584d41544d9c0fb00f5f14d4c7cad.png)
(2)设平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5352c1c02d0e9e0f63b297aa3cb07593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aebaf06bb1c96aecf49603c6a6bfcea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
您最近一年使用:0次