1 . 如图所示,在四棱锥
中,平面
平面
,
,
是等边三角形,已知
,
.
![](https://img.xkw.com/dksih/QBM/2020/6/8/2480336113901568/2480765800988672/STEM/50eec9a140784640942736cc5710038f.png?resizew=175)
(1)设
是
上的一点,求证:平面
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a4426db778693c875e2dca9220875d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd8e727e4efc22b49649f71ae9c9d84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58579094b5d753e9205c2ec89ca3ae07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e8d9bd81b063a824baf17d947db5ee.png)
![](https://img.xkw.com/dksih/QBM/2020/6/8/2480336113901568/2480765800988672/STEM/50eec9a140784640942736cc5710038f.png?resizew=175)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6fb16d2f0db758b8b7a8d3743143f48.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
2 . 如图所示,在四棱锥
中,
底面
,底面
是矩形,
是
的中点,
.
![](https://img.xkw.com/dksih/QBM/2019/6/7/2220514461614080/2220747020951552/STEM/3c37f6f7e94a4c7aa22c4abda7374635.png?resizew=159)
(1)在线段
上找一点
,使得
平面
,并说明理由;
(2)在(1)的条件下,求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f6967901d6c855864df01e7bf7a15c.png)
![](https://img.xkw.com/dksih/QBM/2019/6/7/2220514461614080/2220747020951552/STEM/3c37f6f7e94a4c7aa22c4abda7374635.png?resizew=159)
(1)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b48a987e3d4b83ee4a142e89b4a1ba71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)在(1)的条件下,求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91a2712f9cc643d4983d37c9dfe880ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
2018-07-21更新
|
508次组卷
|
3卷引用:云南省景东彝族自治县第一中学2018-2019学年高二上学期期中考试数学(理)试题