1 . 在如图所示的直三棱柱
中,
.
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e037927a7e5aefa8c428a960d582bdcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f77351271471f97192dc30a0db840f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b083008d31d3f029aa40dbf2a6a1d3.png)
您最近一年使用:0次
2023-08-07更新
|
336次组卷
|
3卷引用:陕西省延安市宜川中学2020-2021学年高一上学期期末数学试题
名校
解题方法
2 . 如图,四棱锥
中,底面
为平行四边形.
,
,
,
底面
.
![](https://img.xkw.com/dksih/QBM/2022/12/8/3126685421641728/3127424343736320/STEM/8c22e4b5422e4a37ac176684ccddeb49.png?resizew=212)
(1)证明:
平面
;
(2)求三棱锥
的体积
![](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/b624742fe28db114e0554c6c87bff05c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9ad150cb1e4cd8977d4cc3d99be17c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2022/12/8/3126685421641728/3127424343736320/STEM/8c22e4b5422e4a37ac176684ccddeb49.png?resizew=212)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b172e3aae625013716b30fae2c59279.png)
您最近一年使用:0次
3 . 如图所示,在梯形CDEF中,四边形ABCD为正方形,且
,将
沿着线段AD折起,同时将
沿着线段BC折起.使得E,F两点重合为点P.
![](https://img.xkw.com/dksih/QBM/2019/12/26/2363698988974080/2364051018088448/STEM/7d4585bd-bb04-4cd5-8fbc-6c947dd1adba.png)
(1)求证:平面
平面ABCD;
(2)求点D到平面PBC的距离h.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dabe6f02012bf9ca548dbb3f86d4cff3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6830ebecddbd9759be626289c408e4f3.png)
![](https://img.xkw.com/dksih/QBM/2019/12/26/2363698988974080/2364051018088448/STEM/7d4585bd-bb04-4cd5-8fbc-6c947dd1adba.png)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
(2)求点D到平面PBC的距离h.
您最近一年使用:0次
2019-12-27更新
|
734次组卷
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3卷引用:陕西省延安中学2020届高三下学期期末质量检测数学试题