如图,等腰
与四边形
所在平面互相垂直,若
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3eb59251a61bd8374fcda5efee3b921.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/19/7d4a564c-a030-44f4-b964-6d89f98d4eb6.png?resizew=199)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
平面
;
(2)若
,求四面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1a3b94566843e92ce775ff6bdf386fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef185a1b221d9a9b15cc548df459d511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3eb59251a61bd8374fcda5efee3b921.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/19/7d4a564c-a030-44f4-b964-6d89f98d4eb6.png?resizew=199)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96a632f7a6a7a98525731156ea8c82d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
21-22高一下·四川泸州·期末 查看更多[3]
更新时间:2022-09-10 07:33:04
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图,
是半圆
的直径,
是半圆
上除
外的一个动点,
垂直于半圆
所在的平面,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2013/5/30/1571235507347456/1571235512975360/STEM/6cba6f7ec0134f1d9aeeceed9cf881e3.png?resizew=190)
(1)证明:平面
平面
;
(2)当三棱锥
体积最大时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c51e24fe600a16f681637e1e4be49213.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/960881cae7daf8b031c57e5e603e4cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31087aa82ec3e292a75c634f628cff00.png)
![](https://img.xkw.com/dksih/QBM/2013/5/30/1571235507347456/1571235512975360/STEM/6cba6f7ec0134f1d9aeeceed9cf881e3.png?resizew=190)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
(2)当三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32fdd65aa55d1833750ef453a295d19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f18a490a22cac27417ddc794f00a1941.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】如图,圆台
的轴截面为等腰梯形
,
,
,
,圆台
的侧面积为
.若点C,D分别为圆
,
上的动点且点C,D在平面
的同侧.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/38910484-ae81-496f-96ff-0784986be22b.png?resizew=207)
(1)求证:
;
(2)若
,则当三棱锥
的体积取最大值时,求多面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fee8f3cec7f73237eeb6119505b624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a23ebc15ea66abe2eb975cf527b368dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5fdcd878ae4edaff14f1647ecc36e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/570f8b295ee0c7c60e6fe1dbf054ff52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/997b5842f3d4eae1989debee9ae41b9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fee8f3cec7f73237eeb6119505b624.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/38910484-ae81-496f-96ff-0784986be22b.png?resizew=207)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143bc52bf615596ee5d707e8c9592018.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a889f4f060164fb2fc57471b93183633.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31c380651bb919db7111650d73a46c01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e10df339e7f7055c5699236359ceaea.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图所示,在三棱柱ABC—A1B1C1中,AA1⊥BC,∠A1AC=60°,A1A=AC=BC=1,A1B=
.
(1)求证:平面A1BC⊥平面ACC1A1;
(2)如果D为AB中点,求证:BC1∥平面A1CD.
![](https://img.xkw.com/dksih/QBM/2017/4/25/1673280179126272/1736934758359040/STEM/f13a932e2f6c4c0f8fb00ed8930ad507.png?resizew=17)
(1)求证:平面A1BC⊥平面ACC1A1;
(2)如果D为AB中点,求证:BC1∥平面A1CD.
![](https://img.xkw.com/dksih/QBM/2017/4/25/1673280179126272/1736934758359040/STEM/a4388fafe959434bb19a6bc839d51f43.png?resizew=132)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,正方体
的棱长为4,点
为棱
的中点,
分别为棱
,
上的点,且
交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/31/e6f01387-f793-4fea-bd32-a24fc13fde01.png?resizew=163)
(1)求证:
平面
;
(2)求证:四边形
为平行四边形,并计算其面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/617ca68c2f2268c8a04f208dbfda2de2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/31/e6f01387-f793-4fea-bd32-a24fc13fde01.png?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6f470eec1a4c20378bdc575736949b.png)
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