解题方法
1 . 如图,
、
是以
为直径的圆上两点,
,
,
是
上一点,且
,将圆沿直径
折起,使点
在平面
的射影
在
上,已知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/53bb030d-135e-4660-a269-1ed1e060e3d0.png?resizew=274)
(1)求证:
⊥平面
;
(2)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
平面
;
(3)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee6700eacd559c8820a5a5631aee02d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e77686cf448ff6cea9bfc021581da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3acee288e75061ac72203b09fce29904.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/53bb030d-135e-4660-a269-1ed1e060e3d0.png?resizew=274)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6261790c66cc71ee3898afabad0c09f4.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/217286e225eee4d5b7a7041c027393a1.png)
您最近一年使用:0次
2020-03-16更新
|
338次组卷
|
3卷引用:河南省焦作市2014-2015学年上学期高一学业水平测试数学试卷
河南省焦作市2014-2015学年上学期高一学业水平测试数学试卷湖北省恩施州清江外国语学校2019-2020学年高二上学期期末数学试题(已下线)卷10-备战2020年新高考数学自学检测黄金10卷-《2020年新高考政策解读与配套资源》
解题方法
2 . 如图,在三棱柱
中,点D是AB的中点.
![](https://img.xkw.com/dksih/QBM/2020/3/12/2418140642041856/2418547719397376/STEM/3e045eb89467457f976202e860acffe5.png?resizew=253)
(1)求证:
平面
;
(2)若
平面ABC,
,
,
,
,求三棱柱
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://img.xkw.com/dksih/QBM/2020/3/12/2418140642041856/2418547719397376/STEM/3e045eb89467457f976202e860acffe5.png?resizew=253)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4557a368725226f2c8ea2efb7d30e478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbc7e774e4ae40c23bf4ceed179230ca.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8bfe2553e852df73185d017c0a62fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f66f1308e0feb67fa5e1946b4965358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1be17e0a3e51cde1f50f384198e71e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
您最近一年使用:0次
2020-03-13更新
|
709次组卷
|
3卷引用:2016年河南省普通高中学业水平考试数学试题
12-13高二上·云南红河·期末
名校
3 . 如图所示,在四面体PABC中,PC⊥AB,点D,E,F,G分别是棱AP,AC,BC,PB的中点,求证:
(1)DE∥平面BCP;
(2)四边形DEFG为矩形.
您最近一年使用:0次
2018-09-30更新
|
885次组卷
|
8卷引用:河南省焦作市2014-2015学年上学期高一学业水平测试数学试卷
河南省焦作市2014-2015学年上学期高一学业水平测试数学试卷(已下线)2011-2012学年云南省蒙自高级中学高二上学期期末考试文科数学试卷吉林省白城十四中2018届高三下学期期末考试数学(文)试题2018-2019学年高中数学必修2人教版:评估验收卷(二)四川省广安市武胜烈面中学2019-2020学年高二上学期10月月考数学(文)试题新疆阿克苏市实验中学2019-2020学年高二上学期第一次月考数学(文)试题(已下线)复习题四2湘教版(2019)必修第二册课本习题第4章复习题