如图,在正三棱柱
中,D是
的中点,E是
的中点,
是
的中心.
![](https://img.xkw.com/dksih/QBM/2021/6/27/2752127606792192/2790153768992768/STEM/d73af479-cbb7-441e-bde2-501c9ff52916.png?resizew=146)
(1)若
,
,求正三棱柱
的侧面积;
(2)设
,
,若点P在线段
上,且
,是否存在
使得
?如果存在,求
的值;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
![](https://img.xkw.com/dksih/QBM/2021/6/27/2752127606792192/2790153768992768/STEM/d73af479-cbb7-441e-bde2-501c9ff52916.png?resizew=146)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eb48b93b9c88c2a68260193c455b791.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baa3d0db9ad31d33c2883a6efed1dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d8cb98c0adee7ca698d8b17dacb845b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e24766bc915a37f0f43f36e40c9a88e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4486d52b6e410fd7b60428121d96cef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
20-21高一下·安徽阜阳·阶段练习 查看更多[2]
更新时间:2021-08-20 11:25:17
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,直三棱柱
,高为
,底面三角形的边长分别为AB=4a,BC=3a,AC=5a(a>0).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/78a450b6-6100-4e2c-ba3e-2d11b6f381f0.png?resizew=171)
(1)求直三棱柱外接球半径的最小值;
(2)若用这样的两个相同的直三棱柱拼成一个三棱柱或四棱柱,在所有可能的情况中,表面积最小的是一个四棱柱,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e29a3527c3f91e81f2889b6a123cd1f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/78a450b6-6100-4e2c-ba3e-2d11b6f381f0.png?resizew=171)
(1)求直三棱柱外接球半径的最小值;
(2)若用这样的两个相同的直三棱柱拼成一个三棱柱或四棱柱,在所有可能的情况中,表面积最小的是一个四棱柱,求a的取值范围.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】如图,有两个相同的直三棱柱,高为
,底面三角形的三边长分别为
,
.用这两个三棱柱拼成一个三棱柱或四棱柱,若在所有可能的情形中,表面积最小的是一个四棱柱,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbfe017e21d1a4e5cf7b1fbf44fcc0ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9878a063abcb6098d10560f2bf2d4b71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/548ca0329daf84dbc37b4a9b68f5872b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/8cabf1ac-25b6-4031-b2e5-73e0eea17304.png?resizew=197)
您最近一年使用:0次
【推荐1】如图,直三棱柱
中,
,
为
上的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/26/e17a3276-9550-4ffc-86d3-cbb6c6ee956a.png?resizew=143)
(1)证明:平面
平面
;
(2)若
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e8f93af0e5bb540c2b9af4455ee395.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29ef5a1361ddf48f47a1f8fdb6c08e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/445fd58459755841d0c6efe7de06dee6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/26/e17a3276-9550-4ffc-86d3-cbb6c6ee956a.png?resizew=143)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba0fbd88fdb064072eedd136e9cb41ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1829c67e306537d1d4665e8fae2227e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,四棱锥
中,底面
是边长为2的正方形,
,且
,
为
中点.
![](https://img.xkw.com/dksih/QBM/2013/4/28/1571200295804928/1571200301408256/STEM/bcb2235dc2c84083bd0c79855367e5ff.png)
(Ⅰ)求证:
平面
;
(Ⅱ)求二面角
的大小;
(Ⅲ)在线段
上是否存在点
,使得点
到平
面
的距离为
?若存在,确定点
的位置;
若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2013/4/28/1571200295804928/1571200301408256/STEM/47db192f40c1473889aee2fad4e82f82.png)
![](https://img.xkw.com/dksih/QBM/2013/4/28/1571200295804928/1571200301408256/STEM/9f3b4ec135304c89a4e9ab3f2a4faaf4.png)
![](https://img.xkw.com/dksih/QBM/2013/4/28/1571200295804928/1571200301408256/STEM/d7fa0b6811e14e34955ffceaa6c8d5c6.png)
![](https://img.xkw.com/dksih/QBM/2013/4/28/1571200295804928/1571200301408256/STEM/82f0e7e72c9a46559094b6333f18f540.png)
![](https://img.xkw.com/dksih/QBM/2013/4/28/1571200295804928/1571200301408256/STEM/b6ae7d8b74db47648b466968641ed713.png)
![](https://img.xkw.com/dksih/QBM/2013/4/28/1571200295804928/1571200301408256/STEM/15fd261dc5a8475fa6c75b36dc384d8a.png)
![](https://img.xkw.com/dksih/QBM/2013/4/28/1571200295804928/1571200301408256/STEM/bcb2235dc2c84083bd0c79855367e5ff.png)
(Ⅰ)求证:
![](https://img.xkw.com/dksih/QBM/2013/4/28/1571200295804928/1571200301408256/STEM/b92cfa2053d140aba7a63bb55fbb538a.png)
![](https://img.xkw.com/dksih/QBM/2013/4/28/1571200295804928/1571200301408256/STEM/9f3b4ec135304c89a4e9ab3f2a4faaf4.png)
(Ⅱ)求二面角
![](https://img.xkw.com/dksih/QBM/2013/4/28/1571200295804928/1571200301408256/STEM/8664719e42b14364a0ce60be8e637dde.png)
(Ⅲ)在线段
![](https://img.xkw.com/dksih/QBM/2013/4/28/1571200295804928/1571200301408256/STEM/43236ade6f9d4c8abe44847aa9307e53.png)
![](https://img.xkw.com/dksih/QBM/2013/4/28/1571200295804928/1571200301408256/STEM/6f3555c89de541b5a80a86b6a3f25450.png)
![](https://img.xkw.com/dksih/QBM/2013/4/28/1571200295804928/1571200301408256/STEM/b6ae7d8b74db47648b466968641ed713.png)
面
![](https://img.xkw.com/dksih/QBM/2013/4/28/1571200295804928/1571200301408256/STEM/9917d90c59024b20a1a1dd66d50e25cd.png)
![](https://img.xkw.com/dksih/QBM/2013/4/28/1571200295804928/1571200301408256/STEM/1f33d2e85b834b8587f9e7755fda6070.png)
![](https://img.xkw.com/dksih/QBM/2013/4/28/1571200295804928/1571200301408256/STEM/6f3555c89de541b5a80a86b6a3f25450.png)
若不存在,请说明理由.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】圆柱
如图所示,
为下底面圆的直径,
为上底面圆的直径,
底面
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/5/25/2986891897692160/2987724381298688/STEM/5a8b1c56-2246-4566-89d0-40b77e3baf1d.png?resizew=155)
(1)证明:
面
.
(2)求圆柱
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
![](https://img.xkw.com/dksih/QBM/2022/5/25/2986891897692160/2987724381298688/STEM/5a8b1c56-2246-4566-89d0-40b77e3baf1d.png?resizew=155)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/574a6cff0aca240f071ed933c28e32f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(2)求圆柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
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适中
(0.65)
【推荐2】如图,在四面体
中,
是
的中点.
.
(2)若
,点
是四面体
的外接球的球心,求平面
与平面
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89d77014883f9c0fb103a776c5ebe40c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b757706eee506a078fc25e3f33a70cb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1449b14ed60a0160c0aad9e3955e71ec.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】如图所示,在三棱锥
中,
.
;
(2)求二面角
的余弦值;
(3)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ceb1825daa0b8e77625049f61760b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e4b16c2c6c9bd089da78122e9d2511.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e820aec9c1a975242fe6d76408a9cde8.png)
(3)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745e0525a41fe2e2a7739c75a942290b.png)
您最近一年使用:0次