如图(1),边长为
的正方形
中,
分别为
上的点,且
,现沿
把
剪切、拼接成如图(2)的图形,再将
沿
折起,使
三点重合于点
.
![](https://img.xkw.com/dksih/QBM/2012/2/4/1570715194122240/1570715199537152/STEM/c1def121869040afbf65bcaa8ce41ff6.png?resizew=554)
(1)求证:
;
(2)求四面体
体积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b54a965aa682d6d2aa484a43d4941c91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71a82cd5e792c26eba7c54ba4be06fd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d351b2e6452ba92a6f9293c3fa1132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2810e327712deb6197ec92d015f04541.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8414369aceaa4231d66c698380926b14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed540e46bee032e7892bb6619889cd6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccb6b20d284fa7778d94c6331fe7a06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d8eb228f810036c85b42a70c5c191a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d7ffb7889a31b267a85f1ea238138e.png)
![](https://img.xkw.com/dksih/QBM/2012/2/4/1570715194122240/1570715199537152/STEM/c1def121869040afbf65bcaa8ce41ff6.png?resizew=554)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/996b41cf98d25c8599b5d2ced8dfb119.png)
(2)求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3662ccce8c6cd3d084311d04890a8239.png)
12-13高一上·河北衡水·期末 查看更多[1]
(已下线)2011-2012学年河北省衡水中学高一上学期期末考试理科数学
更新时间:2016-12-01 14:11:09
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图,已知直三棱柱
,
,
,
,点
为
的中点.
(1)证明:
∥平面
;
(2)求直线AB1到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209acf15985d1ea1ad86fc4a37e38c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/30/04463e81-3f25-42ac-b542-ff2fc7e23477.png?resizew=158)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a935b7d21a103a264b6e96ecf82dbe4a.png)
(2)求直线AB1到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a935b7d21a103a264b6e96ecf82dbe4a.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】如图,四棱锥
中,底面
是边长为
的菱形,
,
,
为
中点.
![](https://img.xkw.com/dksih/QBM/2017/11/3/1809205152620544/1809809240580096/STEM/67fe00f899134413a9831f1890a6c12d.png?resizew=219)
(1)求证:平面
平面
;
(2)若
,
,
的交点记为
,求证
平面
;
(3)在(2)的条件下求三棱锥
的体积.
![](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/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f75cf0288e9b7c31a426aff6b91a5a8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/2017/11/3/1809205152620544/1809809240580096/STEM/67fe00f899134413a9831f1890a6c12d.png?resizew=219)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54cf75bbfc9db93d27937c8b8e977b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb96e0331eebe80ed1ff610faf531fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)在(2)的条件下求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/578fc8dd7d45fd2799f7d05ac89a2024.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1】如图,在三棱柱
中,
,侧面
为菱形,
为等边三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/405eb2a6-076a-4d2b-a55c-34bc59441d22.png?resizew=147)
(1)求证:
;
(2)若
,点E是侧棱
上的动点,且平面
与平面
的夹角的余弦值为
,求点B到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45224f7eac9d0cef64bf28d93e7721a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c510b85dfbca0e3ab0744655d77e8c93.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/405eb2a6-076a-4d2b-a55c-34bc59441d22.png?resizew=147)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecc98634f2d84e29457b111a0920064d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f7e49be1f66093e6f73b003d7b686b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69bcb3226e013650b7d8827c31dd41d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69bcb3226e013650b7d8827c31dd41d0.png)
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】在四棱锥
中,底面
是边长为6的菱形,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/27/0623ffed-7778-47a4-aa84-f75d49c5066f.png?resizew=245)
(1)证明:
平面
;
(2)若
,M为棱
上一点,满足
,求点
到平面
的距离.
![](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/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32d0710321d97361e5782124bbf7f0c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d9ef979b9f27a28cbda6923e888ccc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/27/0623ffed-7778-47a4-aa84-f75d49c5066f.png?resizew=245)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b23202c2f1f1b4aad3515d785ef64d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af29254fe60a392c249c5791279e9c8.png)
您最近一年使用:0次