名校
解题方法
1 . 如下图是一个正八面体,其每一个面都是正三角形,六个顶点都在球O的球面上,则球O与正八面体的体积之比是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/ab6d45d1-ef7d-40d8-87d2-6e5a5254f39c.png?resizew=146)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/ab6d45d1-ef7d-40d8-87d2-6e5a5254f39c.png?resizew=146)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2 . 如图,
是边长为3的等边三角形,四边形
为正方形,平面
平面
.点
、
分别为
、
上的点,且
,点
为
上的一点,且
.
![](https://img.xkw.com/dksih/QBM/2018/4/14/1923763909844992/1924617081028608/STEM/3e511052972e4bee95ecb477466beb82.png?resizew=178)
(Ⅰ)当
时,求证:
平面
;
(Ⅱ)当
时,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e2903ff33266528a7902ad51cf8d75.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85774242bc1d990b56afd9f993f58cf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fbb1e062a1d59ed02ee1337fb562c24.png)
![](https://img.xkw.com/dksih/QBM/2018/4/14/1923763909844992/1924617081028608/STEM/3e511052972e4bee95ecb477466beb82.png?resizew=178)
(Ⅰ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3cf0f585938ede9eca890a6eb326d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/875d9827a6f048d6f577b794446b930b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
(Ⅱ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ce1335e489c2b0835d7e16ea765e1e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89151b3418437067124ede7499455d15.png)
您最近一年使用:0次
名校
3 . 已知球面上有四个点A,B,C,D,球心为点O,O在CD上,若三棱锥
的体积的最大值为
,则该球O的表面积为____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba6fb5afc7fd86226985c0bd5e53b70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a94c29391d9f14bc34da9e1f5112b7f.png)
您最近一年使用:0次
2018-04-15更新
|
1530次组卷
|
7卷引用:湖南省张家界市2018届高三第三次模拟考试数学(文)试题
解题方法
4 . 如图所示,已知四棱锥
中,底面
为矩形,
底面
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2017/4/10/1662633827008512/1664217348227072/STEM/2597de5f67824e20888bdc3771cbe431.png?resizew=150)
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd893c4964b7f1ef69f0563d74c76d0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2017/4/10/1662633827008512/1664217348227072/STEM/2597de5f67824e20888bdc3771cbe431.png?resizew=150)
(1)指出平面与
的交点
所在位置,并给出理由;
(2)求平面将四棱锥
分成上下两部分的体积比.
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5 . 将一张边长为6 cm的纸片按如图l所示阴影部分裁去四个全等的等腰三角形,将余下部分沿虚线折叠并拼成一个有底的正四棱锥(底面是正方形,顶点在底面的射影为正方形的中心)模型,如图2放置.若正四棱锥的正视图是正三角形(如图3),则正四棱锥的体积是( )
![](https://img.xkw.com/dksih/QBM/2015/1/16/1571965473726464/1571965478879232/STEM/1e1a7a914ccc40209f95ed763c11bc9f.png?resizew=317)
![](https://img.xkw.com/dksih/QBM/2015/1/16/1571965473726464/1571965478879232/STEM/1e1a7a914ccc40209f95ed763c11bc9f.png?resizew=317)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2016-12-03更新
|
452次组卷
|
5卷引用:2017届湖南省张家界市高中毕业班第二次联考数学文试卷