如图,四棱锥
中,底面
为矩形,
底面
,且
,
,点
是
中点
![](https://img.xkw.com/dksih/QBM/2012/2/16/1570743170301952/1570743175880704/STEM/97d3631d-9f28-49c3-bc06-2cffa493dd04.png?resizew=179)
(Ⅰ)若
为
中点,证明:
//平面
;
(Ⅱ)若
是
边上任一点,证明:
;
(Ⅲ)若
,求直线
与平面
所成角的正弦值.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7b6d04f024ca05cdfacc8ce9137c15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/2012/2/16/1570743170301952/1570743175880704/STEM/97d3631d-9f28-49c3-bc06-2cffa493dd04.png?resizew=179)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a395778dcf588264f40e1cd8c96206d.png)
(Ⅲ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d9e036eecc9aebcc2d2a2855bbfafdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37793a3a810e823e10c340986f55ddd.png)
12-13高三上·海南省直辖县级单位·期末 查看更多[1]
(已下线)2012届海南省琼海市嘉积中学高三第一学期期末理科数学试卷
更新时间:2016-12-01 15:08:04
|
相似题推荐
解答题-证明题
|
适中
(0.64)
【推荐1】如图,四边形ABCD与BDEF均为菱形,∠DAB=∠DBF=60°,AB=2,且FA=FC.
![](https://img.xkw.com/dksih/QBM/2016/4/27/1572605673512960/1572605679632384/STEM/00f8ab2fadae427fa5ff2d69a763f09a.png)
(1)求证:AC⊥平面BDEF;
(2)求三棱锥E﹣ABD的体积.
![](https://img.xkw.com/dksih/QBM/2016/4/27/1572605673512960/1572605679632384/STEM/00f8ab2fadae427fa5ff2d69a763f09a.png)
(1)求证:AC⊥平面BDEF;
(2)求三棱锥E﹣ABD的体积.
您最近一年使用:0次
解答题-证明题
|
适中
(0.64)
【推荐2】如图,正方形
和四边形
所在平面互相垂直,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572523181506560/1572523187757056/STEM/7f7d35ead06444b5a97360b70f54337d.png)
(1)求证:
平面
;
(2)求证:
平面
;
(3)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34b0c4c783dd55685bd3e88bb31c6696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bcc5e0709048d84ea1b0df0e4a1064b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac19d4472be244b100f9239d036c8a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d94bbd04bbe142e2bb2a2d836a198325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c41570cf4119bd2bb99857aeb656084.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/310d564ca2e2a53b2dad45836fa77ddb.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572523181506560/1572523187757056/STEM/7f7d35ead06444b5a97360b70f54337d.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2229bfd3ca52c4ba5eb9bfd691e703e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d2eb50b211620dbee09bc517dadffa1.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d03716ca46b8fb7cb42d8b2a6f75ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d2eb50b211620dbee09bc517dadffa1.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f5e3f03c2ff2b194b0aa216213c5bed.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,在三棱柱
中,
为正方形,
为菱形,
,平面
平面
.
![](https://img.xkw.com/dksih/QBM/2016/4/29/1572611780354048/1572611786670080/STEM/0cf0e473d2494cafbcb2a6b2bc5a0fd5.png?resizew=200)
(Ⅰ)求证:
;
(Ⅱ)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b51221630159e52bda685680fa684d8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce04b35c265cc9c48b60204bd2f718ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://img.xkw.com/dksih/QBM/2016/4/29/1572611780354048/1572611786670080/STEM/0cf0e473d2494cafbcb2a6b2bc5a0fd5.png?resizew=200)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb81a917e1183890a82885b350b63f14.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dfb64c679bf4a62e5ee092d8885fc09.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1】在四棱台
中,底面
是边长为2的菱形,
,
,
平面
.
![](https://img.xkw.com/dksih/QBM/2021/2/1/2648820234764288/2650049326301184/STEM/68a759a6-ed6b-4289-91f4-9525358b1a6a.png)
(1)
是棱
的中点,求证:
平面
;
(2)试问棱
上是否存在点
,使得二面角
的余弦值是
?若存在,求点
的位置;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa6810c79d0cb6b79547189134a8882.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2021/2/1/2648820234764288/2650049326301184/STEM/68a759a6-ed6b-4289-91f4-9525358b1a6a.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10a7981b44866946aa11f9a2298824c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b724168afaee2ecddf97257180be18.png)
(2)试问棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27f845ae2dc7825deb574258bcae15cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e232c260330351c73c3335892e3bf144.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】如图,四棱锥
的底面
是长方形,侧棱
底面
,
,E是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/9592e0ed-e67d-441f-b47b-16781ed64db1.png?resizew=199)
(1)证明:
平面
;
(2)若点F在线段
(不包含端点)上,二面角
为
,且直线
平面
,求线段
的长.
![](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/6c2318ff49463f17ddd0afff48ed4988.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/9592e0ed-e67d-441f-b47b-16781ed64db1.png?resizew=199)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373f735f0f04d11f1951eaef1bb78b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)若点F在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad6a0cee8226e82cc57916e10d533369.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0da6b7bf79e79c720d2326b4ea14a185.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.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1】如图,在四棱锥
中,底面
为正方形,
平面
,
,点
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/2020/4/3/2433297950605312/2436995336757248/STEM/78a9038bc6f340739417a7b39e3a1259.png?resizew=233)
(Ⅰ)求证:
;
(Ⅱ)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
平面
;
(Ⅲ)求平面
与平面
所成二面角
(锐角)的余弦值.
![](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/71d05cabe8b2ed458352638ef291ab45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b199a99e53d67ff4abf233930961a29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3075b2f43a68bb57d72f29778feee326.png)
![](https://img.xkw.com/dksih/QBM/2020/4/3/2433297950605312/2436995336757248/STEM/78a9038bc6f340739417a7b39e3a1259.png?resizew=233)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d55bc62f8afd58b044a0c24bf361d0c5.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(Ⅲ)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cdf70a06233b5d7b97b25eaa1b250cd.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在四棱锥
中,侧面
底面
,侧面
底面
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/9832d5b2-b715-484f-a4d0-3083803dc9bf.png?resizew=209)
(1)证明:
平面
.
(2)当直线
与平面
所成的角最大时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/010a32eb621302fe4a397f7a667d5071.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392b9e1a179a6676362679354a9e7e51.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/9832d5b2-b715-484f-a4d0-3083803dc9bf.png?resizew=209)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02a7ba7cd0c654714c967a900513ba16.png)
您最近一年使用:0次