如图,已知四棱锥
中,
平面
,
是直角梯形
,
.
![](https://img.xkw.com/dksih/QBM/2012/2/21/1570761043222528/1570761048047616/STEM/272615004145458cab8ec3112c1e9ed5.png?resizew=134)
(1)求证:
;
(2)在线段
上是否存在一点
,使
平面
,若存在,指出点
的位置并加以证明;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.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/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9682b22ece60f87f90c422512ccf4e.png)
![](https://img.xkw.com/dksih/QBM/2012/2/21/1570761043222528/1570761048047616/STEM/272615004145458cab8ec3112c1e9ed5.png?resizew=134)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c583493109d50c9e4634c05e9042a9f.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31c34b18525831f3eda7bb90be0199b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
12-13高二上·新疆乌鲁木齐·期末 查看更多[1]
(已下线)2011-2012学年新疆乌鲁木齐八中高二上学期期末考试文科数学
更新时间:2016-12-01 15:44:26
|
相似题推荐
解答题-证明题
|
适中
(0.65)
真题
名校
【推荐1】如图,在四棱锥
中,
平面
,
.
![](https://img.xkw.com/dksih/QBM/2016/7/11/1572902869622784/1572902875832320/STEM/137fee45c5de4b2dbcad9a2aae0711e7.png?resizew=212)
(Ⅰ)求证:
;
(Ⅱ)求证:
;
(Ⅲ)设点E为AB的中点,在棱PB上是否存在点F,使得
平面
?说明理由.
![](https://img.xkw.com/dksih/QBM/2016/7/11/1572902869622784/1572902875832320/STEM/392c0d88f9b34d5eb236dd8b3bd4d73e.png?resizew=73)
![](https://img.xkw.com/dksih/QBM/2016/7/11/1572902869622784/1572902875832320/STEM/bcc258aafc094a9d9def385e89c1bc75.png?resizew=41)
![](https://img.xkw.com/dksih/QBM/2016/7/11/1572902869622784/1572902875832320/STEM/11714c710b0945faa8921c039d4cdd98.png?resizew=48)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90a4d63506bb5331a5dd5fd2d6dea04f.png)
![](https://img.xkw.com/dksih/QBM/2016/7/11/1572902869622784/1572902875832320/STEM/137fee45c5de4b2dbcad9a2aae0711e7.png?resizew=212)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235cb19c33db9c968981a0be860cc519.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40896a00f73b3751ee320961ba074a0b.png)
(Ⅲ)设点E为AB的中点,在棱PB上是否存在点F,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed51fde9964882b4f4b9be3a38780ad1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05550b8eee5fff00322ad84f80a5a8a2.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
解题方法
【推荐2】如图,在四棱锥
中,底面
为矩形,平面
平面
,
,
,
为
的中点.在棱
上是否存在一点
,使得
平面
?若存在,求
的值;若不存在,请说明理由.
![](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/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0453cfd7e92bf7746a88280b9e7b580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b70cef0b79ca64acbb67dc667fc53b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212a67f115d1cbe69f100b489babe5f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fddc06fe64a538283be16c816f059e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/22/74f0d918-3fa7-43ec-9af7-537c429190b7.png?resizew=203)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】在矩形
中,
,
,点
是线段
上靠近点
的一个三等分点,点
是线段
上的一个动点,且
.如图,将
沿
折起至
,使得平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/cd27a4ec-30cb-4b08-adee-7d803a4431b7.png?resizew=170)
(1)当
时,求证:
;
(2)是否存在
,使得三棱锥
与三棱锥
的体积之比为
?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce552d6e4e8bca4d93e5cb01d8685600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0051d92c8639713847682826c2bb9783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252053b853152bd294a8315debd00b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/289d7a880379d6060065c829b45b0ed6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655b6a742dbacdab5aaa298007663dd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d88c47f9eb6a5ec79b61d7873d0e72f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9222fc73ffe743adf9bfb5ee22184373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfd8b48a3260c8a42fc69fe2f826b29c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6265f4ec2c26eae60ac66e882ff448bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d70676406f26d339465fe3473c0c05.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/cd27a4ec-30cb-4b08-adee-7d803a4431b7.png?resizew=170)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/253c1036cfa4a9f4058906069e03faee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd458eace4ad63c8702bcf4a36b59cc9.png)
(2)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13c62e7c58606b2250c6d189d85a6ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db26bad88328665735fadf82f44d6730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b2c673e86dc8bf49f3b34256ee79679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae7e898fab974ffdae67392997a6f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13c62e7c58606b2250c6d189d85a6ea8.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】如图,四棱锥
中,四边形
为直角梯形,
,
在底面
内的射影分别为
,
.
求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307d38cc7012c328f1f22aa793fe76d7.png)
![](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/b76b001a0994cc740563f20b185964d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930e85bc9f73e86cfb6ce9b076433f1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df7fc746f8c4801d8f2f0471ba3297e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5204ad2a40c7bb60751d92f64409742.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307d38cc7012c328f1f22aa793fe76d7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/22/b5004d69-be62-4ab3-904a-dbecf0bd9a40.png?resizew=173)
您最近一年使用:0次