如图,已知多面体ABCDEF中的四边形ABCD是正方形,
是以BC为斜边的等腰直角三角形,
,
是等边三角形,M是棱BC的中点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/bd2707d7-8080-4a37-a544-ba63739cd00b.png?resizew=203)
(1)证明:
平面BCF.
(2)设
,求多面体ABCDEF的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6830ebecddbd9759be626289c408e4f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/058f36d315245b63a811d5c6f348c17b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6cc74d5754eeb269bcdc63c78a26692.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/bd2707d7-8080-4a37-a544-ba63739cd00b.png?resizew=203)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.png)
更新时间:2021-08-31 23:34:43
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】在如图如示的多面体中,平面
平面
,四边形
是边长为
的正方形,
∥
,且
.
(1)若
分别是
中点,求证:
∥平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求此多面体
的体积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77d8c77f758b4a06c320be39ecb328f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6480f384476190883f06c0289c7519.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946c16d99496d31ce4d87301a4793393.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2622c81bc1e2f35e7793ffb1233ef42.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b1efb5d9072a67be9d5497a783016c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求此多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/1c1e4d17-5cd7-499e-a4c3-624b610be85b.png?resizew=168)
您最近一年使用:0次
【推荐2】如图是一个奖杯的三视图,试根据奖杯的三视图计算它的表面枳和体积(尺寸如图,单位:cm).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/13/7bf9be8a-b3b3-433c-a06b-0576dec619cf.png?resizew=417)
注:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/13/7bf9be8a-b3b3-433c-a06b-0576dec619cf.png?resizew=417)
注:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9356948217cee1f2e15c92ea98037b02.png)
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】如图所示,在四棱锥
中,
为等边三角形,
,
⊥平面
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/2/7a3ae5ce-6c13-4f7a-b4be-bccab23da63a.png?resizew=277)
(1)证明:
;
(2)若
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.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/2022/9/2/7a3ae5ce-6c13-4f7a-b4be-bccab23da63a.png?resizew=277)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dbd5a0555343744f1b300eecba8813f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e77c16357eabed95d85bbd4e3dada92e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.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】已知矩形ABCD中,
,
,
分别为
中点,
为对角线
交点,如图1所示.现将
和
剪去,并将剩下的部分按如下方式折叠:沿
将
,
折叠,并使
与
重合,
与
重合,连接
,得到由平面
,
,
,
围成的无盖几何体,如图2所示.
(1)求证:
平面
;
(2)若
为棱
上动点,求
的最小值;
(3)求此多面体体积
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffc2817fa590affb5a760a25dc65308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d93949d8a15aca4e79cedb978590571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372629a8666de1e9bac3e7daadcac7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7ffcd1925a2b1259221c6a476152f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73bce2ee14d4769b17c26ebca1788860.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c48d06e400aa9ee1c1e958fa8ea19730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1220cf7442bc7658dbd74a845a62dfce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5445e7a30a0a69c66289889341142b16.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/31/4f5b71c2-bf45-4761-ba79-6241e73ca430.png?resizew=395)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93cf663ee2bf1ac5c43f4306fa0cf250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa16146cb21f11693feffb0876c0795b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00d4f264aff7b91d14b39abd9f3b0243.png)
(3)求此多面体体积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
您最近一年使用:0次