如图,正三棱柱ABC—A1B1C1的各棱长都相等,M、E分别是
和AB1的中点,点F在BC上且满足BF∶FC=1∶3.
![](https://img.xkw.com/dksih/QBM/2014/2/12/1571506197364736/1571506202992640/STEM/475a6d4ea09f482b855903de5f1546be.png)
(1)求证:BB1∥平面EFM;
(2)求四面体
的体积.
![](https://img.xkw.com/dksih/QBM/2014/2/12/1571506197364736/1571506202992640/STEM/b111eea127594f67a9b11a257cb66e77.png)
![](https://img.xkw.com/dksih/QBM/2014/2/12/1571506197364736/1571506202992640/STEM/475a6d4ea09f482b855903de5f1546be.png)
(1)求证:BB1∥平面EFM;
(2)求四面体
![](https://img.xkw.com/dksih/QBM/2014/2/12/1571506197364736/1571506202992640/STEM/954fd03a260541258fba4271d9cf18d3.png)
13-14高三上·上海长宁·阶段练习 查看更多[1]
(已下线)2014届上海市长宁区高三上学期教学质量检测理科数学试卷
更新时间:2016-12-02 16:59:59
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图1所示,在平行四边形
中,
,
,将
沿
折起,使得二面角
的大小为
,如图2所示,点
为棱
的中点,点
为棱
上一动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/569a2295-8d16-414e-8b51-46bac0a8002b.png?resizew=412)
(1)证明:
;
(2)若四棱锥
的体积为
,求直线
与平面
所成角的正弦值的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4864c21e9664fa9111ede6425b09563a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c583493109d50c9e4634c05e9042a9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc4c58d7bdd6ecebf94c0d6add63ba6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f479b251fdb01bae6d16abb7f2d694a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/569a2295-8d16-414e-8b51-46bac0a8002b.png?resizew=412)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4737454d911a7d41ce1a8521631a6c59.png)
(2)若四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐2】在四棱锥
中,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
,
是线段
上的点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/b2b11e44-dc79-423f-b312-152974c5961e.png?resizew=158)
(1)求证:
底面
;
(2)是否存在点
使得三棱锥
的体积为
?若存在,求出
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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd7a66e971ec041fbb0b09318df77f30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd3d71dcafa623cc5a69ae60a4735286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/b2b11e44-dc79-423f-b312-152974c5961e.png?resizew=158)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d492a2248463e0c0199a25d0f76d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d86ab7c97cd8a0b15ba5efc1be94230.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fb4402e082c123111c12fc6cc3acbc9.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1】如图,四面体
中,
,
分别是
、
的中点,
,
.
平面
;
(2)若
为
上的一点,且
,求证:
平面
.
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6559aabe16c2318687089e7cc498b98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65d5853c26657db448af610ac72cca4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce03b310edce42191f9fa75a1c909ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1edcb9c6a5b0b7155b2aa753872ff0e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42c5d424595484deb27fc45da871050.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14c8d14529fa65aae04dcc3f2b3a5c90.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,在棱长为4的正方体
中,设E是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/e0cf4309-87e9-45d4-9c67-9cea9375adc1.png?resizew=157)
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/e0cf4309-87e9-45d4-9c67-9cea9375adc1.png?resizew=157)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8197bf06d017950c85c3ba6a291c095e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1c1acd7da8817385417e1dff25bfe25.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e63fa0d9702ebcae364f0d06db855a29.png)
您最近一年使用:0次