如图,在平行四边形ABCD中,AB=1,BC=2,∠CBA=
,ABEF为直角梯形,BE∥AF,∠BAF=
,BE=2,AF=3,平面ABCD⊥平面ABEF.
![](https://img.xkw.com/dksih/QBM/2020/7/22/2511607964172288/2512004196352000/STEM/879ced4f-6962-4595-a58d-16974a208958.png)
(1)求证:AC⊥平面ABEF.
(2)求多面体ABCDE与多面体ADEF的体积的比值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ad72d7565699d1ebb741eb0ce12bac.png)
![](https://img.xkw.com/dksih/QBM/2020/7/22/2511607964172288/2512004196352000/STEM/879ced4f-6962-4595-a58d-16974a208958.png)
(1)求证:AC⊥平面ABEF.
(2)求多面体ABCDE与多面体ADEF的体积的比值.
更新时间:2020-07-23 11:48:31
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相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在四棱锥
中,已知
平面
,
,
,
,且
.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712323799859200/2715189758025728/STEM/392f4100-fd1f-4ee3-b8da-be8dcd9a2794.png?resizew=189)
(1)求四棱锥
的体积;
(2)求直线
与平面
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4117625867a74cd022584500c76deca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0edb1508fc95765f3bb316bcb5252d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12143a06ed24558d8cc7ad39961d3e1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d028a62fea771beb2d18f0c1bf856c7.png)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712323799859200/2715189758025728/STEM/392f4100-fd1f-4ee3-b8da-be8dcd9a2794.png?resizew=189)
(1)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4117625867a74cd022584500c76deca.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddb7c2ca1b6bee86cb24fed02e40da2.png)
您最近一年使用:0次
【推荐2】如图,在直三棱柱
中,侧棱
底面
,
,
为
的中点,
,
.
![](https://img.xkw.com/dksih/QBM/2020/10/31/2583099410006016/2583127494098944/STEM/10a1b95726304b4fb3aae888b6007b58.png?resizew=161)
(1)证明:
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a935b7d21a103a264b6e96ecf82dbe4a.png)
(2)求异面直线
与
所成角的余弦值;
(3)求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.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/35909b72f6e48a33ae9abb1d63ff91aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://img.xkw.com/dksih/QBM/2020/10/31/2583099410006016/2583127494098944/STEM/10a1b95726304b4fb3aae888b6007b58.png?resizew=161)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1496afecd92a619fbe5e9b736f06f4e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a935b7d21a103a264b6e96ecf82dbe4a.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
(3)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb420e9a5faa91baf74a2f687b30f514.png)
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图,在四棱锥
中,底面
是平行四边形,
平面
,
,
,
是棱
上的一点.
![](https://img.xkw.com/dksih/QBM/2020/11/24/2600039995957248/2600577107099648/STEM/aec9418e4e914213be16de5976c7d6b8.png?resizew=156)
(1)证明:
平面
;
(2)若
平面
,求
的值.
![](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/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/251048aaeb0a16b152152a64d966b4f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c406e7d1e7977dd5b30ef81cfdc8e8d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2020/11/24/2600039995957248/2600577107099648/STEM/aec9418e4e914213be16de5976c7d6b8.png?resizew=156)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c2b786c64e6a9ed2ec5670cde74f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/add47889f6b4911133999a898d3666d3.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】如图,直三棱柱
中,
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/2017/6/22/1714464615809024/1716759278518272/STEM/8f6547d8800b412fbd7f0561b6a0a496.png?resizew=189)
(1)
平面
;
(2)平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c69327414a5e212fc378a2835a4d389.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84295f36ee0405ce38be69fa516d1be8.png)
![](https://img.xkw.com/dksih/QBM/2017/6/22/1714464615809024/1716759278518272/STEM/8f6547d8800b412fbd7f0561b6a0a496.png?resizew=189)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4e6e44c1bcd75b3dc46bebee96ac1a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588690c4a218025937357ffab8d63c7a.png)
(2)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/581c0e742e79c5294feea3671874a093.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.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,在平行四边形
中,
,
,
,四边形
为矩形,平面
平面
,
.
![](https://img.xkw.com/dksih/QBM/2022/5/3/2971539639050240/2976938917797888/STEM/0e11e6714aa94be0b5f4c9b2e3ce587a.png?resizew=136)
(1)求证:平面
平面
;
(2)点
在线段
上运动,且
,若平面
与平面
所成的锐二面角的余弦值为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88c44f558705de3bcefcfc0ece96b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c72ba621996811244867b5deaa93562e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a4e3f0349fa83dc2a0b7d798f04843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cee0f36dc452e58086832c0152b641.png)
![](https://img.xkw.com/dksih/QBM/2022/5/3/2971539639050240/2976938917797888/STEM/0e11e6714aa94be0b5f4c9b2e3ce587a.png?resizew=136)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf84ed033bd035c2fe7552badd5e447d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/897ada25cb0f758422a2601f8709b821.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2730b513bd3359c3dfe6567e04f5ef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2977ae4bfa32de8c6f0fb136205c4fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐2】在斜四棱柱中,
,
,平面
平面
,
.
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/297f95177290a83a50c6647ffb90714f.png)
您最近一年使用:0次