1 . 如图,已知四棱锥
的底面为矩形,D为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
的中点,AC⊥平面BCC1B1.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee27ae6e34c2464ca5b6281c3a262caa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
的中点,AC⊥平面BCC1B1.
(Ⅰ)证明:AB//平面CDB1;
(Ⅱ)若AC=BC=1,BB1=,
(1)求BD的长;
(2)求三棱锥C-DB1C1的体积.
您最近一年使用:0次
2 . 如图,三棱柱
中,侧棱垂直底面,
,
,点
是棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/1/6dda620e-726e-47e1-ab92-438f04e3428c.png?resizew=189)
(1)证明:平面
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39e8a50eb8b05d9b6950911b93625c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/1/6dda620e-726e-47e1-ab92-438f04e3428c.png?resizew=189)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44bb8a2ac78928b56c075729c710fdcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4739afd7311501e948aa4e1e5c1cb17.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6808803254be3fdea79116d061c47475.png)
您最近一年使用:0次
2016-12-03更新
|
1059次组卷
|
5卷引用:2014-2015学年广东省肇庆市高二上学期期末考试文科数学试卷
11-12高一上·广东东莞·期末
解题方法
3 . 如图,正方形
的边长为1,正方形
所在平面与平面
互相垂直,
是
的中点.
(1)求证:
平面
;
![](https://img.xkw.com/dksih/QBM/2011/2/22/1570005425086464/1570005430362112/STEM/d6c5a08cbae746979405ee12c3f845d3.png)
(2)求证:
;
(3)求三棱锥
的体积.
![](https://img.xkw.com/dksih/QBM/2011/2/22/1570005425086464/1570005430362112/STEM/90cd07ee6933459d874efbbf13591d41.png)
![](https://img.xkw.com/dksih/QBM/2011/2/22/1570005425086464/1570005430362112/STEM/e6b6b9bdc79d4f94927976d669a4d5b0.png)
![](https://img.xkw.com/dksih/QBM/2011/2/22/1570005425086464/1570005430362112/STEM/90cd07ee6933459d874efbbf13591d41.png)
![](https://img.xkw.com/dksih/QBM/2011/2/22/1570005425086464/1570005430362112/STEM/250059b13f2440eeb25da7eed33a2236.png)
![](https://img.xkw.com/dksih/QBM/2011/2/22/1570005425086464/1570005430362112/STEM/6c6f24b8ed1b4980be4017bdda08d3b0.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2011/2/22/1570005425086464/1570005430362112/STEM/9fe00274328b462192303570b05359cb.png)
![](https://img.xkw.com/dksih/QBM/2011/2/22/1570005425086464/1570005430362112/STEM/da0cee6af4ab4ea49d5f1d02e1465167.png)
![](https://img.xkw.com/dksih/QBM/2011/2/22/1570005425086464/1570005430362112/STEM/d6c5a08cbae746979405ee12c3f845d3.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8c7274d4381e1cdd7483a543b1fde7c.png)
(3)求三棱锥
![](https://img.xkw.com/dksih/QBM/2011/2/22/1570005425086464/1570005430362112/STEM/eeb23cc551664abf8b835a0649a95f12.png)
您最近一年使用:0次
4 . 如图,矩形
中,对角线
的交点为
,
平面
,
,
,
为
上的点,且
.
![](https://img.xkw.com/dksih/QBM/2016/11/3/1573114276339712/1573114282680320/STEM/c731cb56463d4c45877f16ae6d683e15.png?resizew=238)
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29f27c9a3af7044faf147bdaeb3fe81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55b3581f73c778ecb0931c1ab30392ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cbfc35fc915ac7d4dc017e60ccdecbe.png)
![](https://img.xkw.com/dksih/QBM/2016/11/3/1573114276339712/1573114282680320/STEM/c731cb56463d4c45877f16ae6d683e15.png?resizew=238)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26e25ee66687503e95362f2cad5b2ac.png)
您最近一年使用:0次
2016-12-04更新
|
546次组卷
|
3卷引用:2016-2017学年广东省阳春市一中高二文上学期第一次月考数学试卷
11-12高三上·山东济南·期末
解题方法
5 . 如图甲,在平面四边形ABCD中,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf08a764b90cb57e1885ed1898bd97d6.png)
,
,现将四边形ABCD沿BD折起,使平面ABD
平面BDC(如图乙),设点E、F分别为棱AC、AD的中点.
![](https://img.xkw.com/dksih/QBM/2011/9/5/1570302073462784/1570302078836736/STEM/11d873cdca4d49a59f1fd390a9699ddf.png)
(Ⅰ)求证:DC
平面ABC;
(Ⅱ)设
,求三棱锥A-BFE的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf08a764b90cb57e1885ed1898bd97d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2796efcc3f036c17bade621ba57fe588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5fc4ad65b723b6a8da4c8dac154e6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4237f6a1fc115bb790aa10704b7908c3.png)
![](https://img.xkw.com/dksih/QBM/2011/9/5/1570302073462784/1570302078836736/STEM/11d873cdca4d49a59f1fd390a9699ddf.png)
(Ⅰ)求证:DC
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4237f6a1fc115bb790aa10704b7908c3.png)
(Ⅱ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e8cfc92fac8debb8bc06293ccc1685.png)
您最近一年使用:0次
2016-12-03更新
|
2037次组卷
|
8卷引用:2015届广东省深圳市高三上学期第一次五校联考文科数学试卷
(已下线)2015届广东省深圳市高三上学期第一次五校联考文科数学试卷(已下线)2011届山东省莱芜市一中高三上学期期末考试数学文卷(已下线)2012届安徽省桐城八中高三年级模拟测试数学(一)(已下线)2012届安徽省师大附中高三第三次模拟考试文科数学试卷(已下线)2011-2012学年度山东省冠县一中高一上学期期末数学试卷(已下线)2011-2012学年山东省冠县武训高中高一上学期期末考试数学试卷(已下线)2013届安徽省泗县双语中学高三最后压轴卷文科数学试卷2020届江苏省合作联盟学校高三下学期4月模拟数学试题
6 . 如图,已知正方体
的棱长为3,
,
分别是棱
,
上的点,且
.
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572108830924800/1572108837060608/STEM/1d7967ecc7084ad78b85e40286e7d60a.png?resizew=231)
(1)证明:
,
,
,
四点共面;
(2)平面
将此正方体分为两部分,求这两部分的体积之比.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f6915161f031acb190ef16044d76b1.png)
![](https://img.xkw.com/dksih/QBM/2015/5/14/1572108830924800/1572108837060608/STEM/1d7967ecc7084ad78b85e40286e7d60a.png?resizew=231)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
(2)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00615fafac0175b97a8e4ed2b3b5c92f.png)
您最近一年使用:0次
解题方法
7 . 如图,四棱锥
中,底面
为平行四边形,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb7898f9fae834a2048cf56dc8c58cd6.png)
,
底面
.
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572326708469760/1572326714507264/STEM/de7844b34853448a94b6d91d7cb74b9c.png?resizew=343)
(1)证明:
;
(2)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/eb7898f9fae834a2048cf56dc8c58cd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b624742fe28db114e0554c6c87bff05c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572326708469760/1572326714507264/STEM/de7844b34853448a94b6d91d7cb74b9c.png?resizew=343)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b07e317ffe7859e81b42ef4970e344a.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4f2d2ef6661d1808fed0cbd1b0fa53d.png)
您最近一年使用:0次
2016-12-03更新
|
982次组卷
|
2卷引用:2015-2016学年广东省惠阳高级中学高二上学期期中考试理科数学试卷
8 . 如图,在三棱柱
中,
平面ABC,D、E分别是BC和
的中点,已知AB=AC=AA1=4,∠BAC=90°.
![](https://img.xkw.com/dksih/QBM/2015/3/11/1571995989450752/1571995995209728/STEM/f342f4cbaab34d4681b833fc8cb79c6e.png?resizew=195)
(1)求证:
⊥平面
;
(2)求二面角
的余弦值;
(3)求三棱锥
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/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/2015/3/11/1571995989450752/1571995995209728/STEM/f342f4cbaab34d4681b833fc8cb79c6e.png?resizew=195)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87cdc08e1c4a04a18d5ecea03393e36d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a9b32570d553161be04d13954e92a1.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae2bdf9db15b8a052bfa6f2f964b40f.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/499d54ecf0ef57721f4ae678ae58614d.png)
您最近一年使用:0次
9 . 如下图所示的几何体中,
为三棱柱,且
,四边形
为平行四边形,
,
.
![](https://img.xkw.com/dksih/QBM/2017/11/16/1818318000185344/1818522644185088/STEM/84c253d29f7b4be881ac9547c4897412.png?resizew=174)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc61a2aa5d8aebe6773d235f31ed81f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42b730d87bb95763a48c69f1b0329ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a547691c1217bbf731a7061eff4c65bc.png)
![](https://img.xkw.com/dksih/QBM/2017/11/16/1818318000185344/1818522644185088/STEM/84c253d29f7b4be881ac9547c4897412.png?resizew=174)
(1)求证:;
(2)若,求证:
;
(3)若,二面角
的余弦值为若
,求三棱锥
的体积.
您最近一年使用:0次