如图,在棱长为2的正方体
中,
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/2011/3/17/1570046058397696/1570046063738880/STEM/442e0326-c9ce-49d7-bef7-2ca31929c477.png?resizew=180)
(1)求证:
平面
;
(2)求证:
;
(3)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b866a756d422faec0f7eb229dfaabf.png)
![](https://img.xkw.com/dksih/QBM/2011/3/17/1570046058397696/1570046063738880/STEM/442e0326-c9ce-49d7-bef7-2ca31929c477.png?resizew=180)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679748eab882a6be0fefd2cc300349a4.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d435974639ea2850bb5c21efe64b123b.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3d48dafb6b017b5739106c1b88be7ee.png)
2011·江苏宿迁·二模 查看更多[6]
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更新时间:2016-11-30 15:29:48
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【推荐1】已知在圆锥SO中,底面
的直径
,
的面积为48.
(1)求圆锥SO的表面积;
(2)一球刚好放进该圆锥体中,求这个球的半径以及此时圆锥体剩余空间.
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(1)求圆锥SO的表面积;
(2)一球刚好放进该圆锥体中,求这个球的半径以及此时圆锥体剩余空间.
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【推荐2】如图,在Rt△AOB中,AO=OB=2,△AOC通过△AOB以OA为轴顺时针旋转120°得到(∠BOC=120°).点D为斜边AB上一点,点M为线段BC上一点,且CM=OM.
![](https://img.xkw.com/dksih/QBM/2021/6/13/2742311663616000/2742737708294144/STEM/75e0829be0444fa28ff60895ca5480b0.png?resizew=164)
(1)证明:
平面
;
(2)当D为线段AB中点时,求多面体OACMD的体积.
![](https://img.xkw.com/dksih/QBM/2021/6/13/2742311663616000/2742737708294144/STEM/75e0829be0444fa28ff60895ca5480b0.png?resizew=164)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b6e1092115b2d153849de1a20cdd53c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
(2)当D为线段AB中点时,求多面体OACMD的体积.
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【推荐1】我国古代数学名著《九章算术》中,称四面都为直角三角形的三棱锥为“鳖臑”.如图,三棱锥
中,
平面
,
.
为鳖臑;
(2)若
为
上一点,点
分别为
的中点,平面
与平面
的交线为
.证明:直线
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b938297d03de0a52f3e6a03b67446169.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4984ee07d47dbcc4705137cd6d931d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5391aca6060cf4471618a660ec065a6.png)
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【推荐2】如图,在底面为平行四边形的四棱锥
中,点
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/11215dbc-c054-45e0-8aee-9c97c03f972e.png?resizew=162)
(1)求证:
平面
;
(2)若
,
,
,
平面
,
,求异面直线
,
所成的角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/11215dbc-c054-45e0-8aee-9c97c03f972e.png?resizew=162)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa69a2247ad4d5231aa361349b12f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd4f08c004effa36bcec4bcdf6bb6a9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.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/2a58a622e2b1a239f2f96aa1501e9799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
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【推荐3】如图,在四棱锥
中,底面
是直角梯形,
,
,
为等边三角形,且平面
底面
,
,
,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/18ce9b9a-e118-42a6-a225-94d3af90631a.png?resizew=186)
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6045266f6db39e41b7abde762d9e9a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/18ce9b9a-e118-42a6-a225-94d3af90631a.png?resizew=186)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acf2bc3dd1f1ae5d5e28b0366f454ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c020d9691ea4150813a7dcf9f87fc0.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c020d9691ea4150813a7dcf9f87fc0.png)
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【推荐1】四棱锥
中,
平面ABCD,底面ABCD是正方形,
,点E是棱PC上一点.
平面BDE;
(2)当E为PC中点时,求
所成二面角锐角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
(2)当E为PC中点时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/445b51117626fbd3373e32acc514c64b.png)
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【推荐2】如图,四棱锥PABCD的底面是菱形,
,
.
![](https://img.xkw.com/dksih/QBM/2020/4/5/2435070536204288/2435807043780608/STEM/7b95f1a3883e4a3fa071a9eb795400c7.png?resizew=209)
(1)证明:
;
(2)若
,
,求点B到平面PAD的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea9f9fcdffb61b5366a158ebd115cd3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e4d19bf237a6fca67e0d01a9ddb726.png)
![](https://img.xkw.com/dksih/QBM/2020/4/5/2435070536204288/2435807043780608/STEM/7b95f1a3883e4a3fa071a9eb795400c7.png?resizew=209)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e4b16c2c6c9bd089da78122e9d2511.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de9a31b4fce9307e48458fa5ce44779c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83640592853a53872d7af69c0cffc1bb.png)
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