1 . 如图,四棱锥
的底面是正方形,
平面
,
,点
是
上的点,且
.
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572056380186624/1572056385413120/STEM/f300eea382804859862b876eb7c13c38.png)
(1)求证:对任意的
,都有
;
(2)若二面角
的大小为
,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5aa0d36da718de7c50a781b8e2bb8e1.png)
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572056380186624/1572056385413120/STEM/c994553398f94bd5a709d8c950a88185.png)
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572056380186624/1572056385413120/STEM/f930ac4af6344e3cb83cd40583ebe9b1.png)
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572056380186624/1572056385413120/STEM/0d36461557874326a8bbc001598f69c8.png)
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572056380186624/1572056385413120/STEM/31ccb82c648d456f83efe9ef5e138d40.png)
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572056380186624/1572056385413120/STEM/75f540e60181473199254f2b8e7e90f2.png)
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572056380186624/1572056385413120/STEM/a205d01f50d34b54a25f239ad7c0dcc3.png)
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572056380186624/1572056385413120/STEM/f300eea382804859862b876eb7c13c38.png)
(1)求证:对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeea10aff1d23cc98c9097749cde097a.png)
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572056380186624/1572056385413120/STEM/4fd22d154d4c4f1f9936b6f1535c209d.png)
(2)若二面角
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572056380186624/1572056385413120/STEM/43c3fb950ebf4e0a9d34e14afb688618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a21e7c3cd84ab1feddfbe9e6f5c11ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5fffd330dd6b9241659d790bd2a7fb2.png)
您最近一年使用:0次
2 . 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)
您最近一年使用:0次
2016-12-04更新
|
827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
真题
解题方法
3 . 如图,直三棱柱
,
,
AA′=1,点M,N分别为
和
的中点.
(Ⅰ)证明:
∥平面
;
(Ⅱ)求三棱锥
的体积.(锥体体积公式V=
Sh,其中S为底面面积,h为高)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71f2185273bf04c11118c7954f7ec822.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8e9ec412ea0355e4e5cd06c60e5fee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ca55d4d34001bd8e61aff927bbdde22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a06faea49d957a5bab3fe0582f76ff23.png)
(Ⅱ)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da1761eb53405d5012c232c0f8bc7d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://img.xkw.com/dksih/QBM/2012/7/5/1570916036952064/1570916042448896/STEM/27ed100150ab4c1fa0e318e93e523300.png?resizew=238)
您最近一年使用:0次
2016-12-01更新
|
2367次组卷
|
6卷引用:2015-2016学年辽宁省沈阳二中高二上10月月考数学试卷