在直三棱柱
中,
,
,
、
分别为棱
、
的中点,点
在棱
上.
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625387384979456/1625923945103360/STEM/6817f962-d2d2-4b16-b3db-01c970e6acfd.png?resizew=162)
(1)证明:直线
平面
;
(2)若
为棱
的中点,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb717228e1762d335814a3adc90eae45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625387384979456/1625923945103360/STEM/6817f962-d2d2-4b16-b3db-01c970e6acfd.png?resizew=162)
(1)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4f95dad4c29bcad7f621c453007a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08052a312e4a29b6840a78850d666d92.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/610038cde1968e0a15792ce77dd0e99f.png)
更新时间:2017-02-17 14:13:38
|
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解答题-问答题
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解题方法
【推荐1】求球与它的外切等边圆锥(轴截面是正三角形的圆锥叫等边圆锥)的体积之比.
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【推荐2】如图,圆柱
的底面半径为1,侧面积为
,
,
分别是圆柱上、下底面圆的一条直径,且点
在下底面的投影点
平分圆弧
.
的表面上,求球
的表面积;
(2)求四面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e2d7c958e99bcd9d7f251c19ee3544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-证明题
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【推荐1】已知如图,在正三棱柱
中,
为棱
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/9d74100f-2672-4dbf-a39b-3e20a1a61f93.png?resizew=121)
(1)求证:直线
平面
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92105835f8075cb75dff244e908370b5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/9d74100f-2672-4dbf-a39b-3e20a1a61f93.png?resizew=121)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1496afecd92a619fbe5e9b736f06f4e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a935b7d21a103a264b6e96ecf82dbe4a.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf9628142422a4884bd59538da6d312.png)
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【推荐2】如图,在直三棱柱ABC﹣A1B1C1中,已知AB=AC,D,F分别是棱BC,B1C1的中点,E是棱CC1上的一点.求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/f4b9097e-0a38-4b0f-bff0-2498d6fc58cd.png?resizew=151)
(1)直线A1F∥平面ADE;
(2)直线A1F⊥直线DE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/f4b9097e-0a38-4b0f-bff0-2498d6fc58cd.png?resizew=151)
(1)直线A1F∥平面ADE;
(2)直线A1F⊥直线DE.
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