1 . 如图,在四棱锥
中,底面
是菱形,
分别为
的中点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf7e377587fae9c4bfdfb6ab0e572467.png)
(1)证明:
平面
;
(2)若
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7577d45fa2312e55e064fb2fc4f3173f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9d438edd97c22d75e2ec70398ffff25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf7e377587fae9c4bfdfb6ab0e572467.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/073a88b42836fb88433679932b48ad03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/840798a31aba0783f96584e0ad7c0d2e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a053a5eebbc0ae1fcdcb660a8e624d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/068b7c982ae7b57050bc477d3d3136db.png)
![](https://img.xkw.com/dksih/QBM/2017/12/25/1846113336688640/1846717051781120/STEM/427e16da2ff846ef8eb3c26a17073934.png?resizew=210)
您最近一年使用:0次
2 . 如图1,在四棱锥
中,底面
是正方形,
.
(1)如图2,设点
为
的中点,点
为
的中点,求证:
平面
;
(2)已知网格纸上小正方形的边长为
,请你在网格纸上用粗线画图1中四棱锥
的俯视图(不需要标字母),并说明理由.
![](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/c5ca03d3a651df9315d44b3383c23807.png)
(1)如图2,设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f16835e3f230ba3f543b6804e445e283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)已知网格纸上小正方形的边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ec818fc0754296163206e1e8870f9e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://img.xkw.com/dksih/QBM/2017/2/8/1625054100037632/1625054100709376/STEM/de21d7a116134e649e2be185df375101.png)
您最近一年使用:0次
2017-02-16更新
|
287次组卷
|
2卷引用:2016-2017学年山西怀仁一中高二理上学期月考三数学试卷
名校
3 . 在正方体ABCD-A1B1C1D1中,E、F分别是CD、A1D1中点.
![](https://img.xkw.com/dksih/QBM/2017/11/15/1817595502911488/1817931638169600/STEM/3bf7a5524dee4664b575ab6a0fe0eb7f.png?resizew=145)
(1)求证:AB1⊥BF;
(2)若正方体的棱长为1,求
![](https://img.xkw.com/dksih/QBM/2017/11/15/1817595502911488/1817931638169600/STEM/3bf7a5524dee4664b575ab6a0fe0eb7f.png?resizew=145)
(1)求证:AB1⊥BF;
(2)若正方体的棱长为1,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d70408b58aedc71b41132a570c0ac7e.png)
您最近一年使用:0次
4 . 如下图,在三棱锥
中,
,
底面
,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/b4812039-36c5-4ef7-9892-aff3c9f98c4b.png?resizew=177)
(1)若
为
上一点,且
,证明:平面
平面
.
(2)若
为棱
上一点,且
平面
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c482ee1668a59ca21f3ae8b6bad58eae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d2bbd2536b7adaebb38d6df3d1b1e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7840070ecf04ae4831bf79989c4eccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb77bfc351d1498ab4856c190b75b7d0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/b4812039-36c5-4ef7-9892-aff3c9f98c4b.png?resizew=177)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d320f180419175d75eebc618cc458b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a26a7784c7419d8359fb119c8ecc03d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8f3abe8876333c19ae7e36c98a9329b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8818e89658725962a7d6b0f49023e2f4.png)
您最近一年使用:0次
2018-01-06更新
|
531次组卷
|
4卷引用:河南省长葛市第一高级中学2018届高三12月月考数学(文)试题
河南省长葛市第一高级中学2018届高三12月月考数学(文)试题(已下线)黄金30题系列 高二年级数学(理) 大题易丢分(已下线)黄金30题系列 高二年级数学江苏版 大题易丢分安徽省芜湖市第一中学2020-2021学年高二上学期10月第二轮月考理科数学试题
5 . 如图,三棱柱
中,侧棱
平面
,
为等腰直角三角形,
,且
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/2016/2/22/1572490248880128/1572490255147008/STEM/9e4ed8d00be74edea4f7669d98f68663.png)
(1)求证:
平面
;
(2)求三棱锥
的体积.
(3)若点
是
上一点,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19434b67703318b18be7efee7be590bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a788c8a0a8599eecbb25eb870ad72e5.png)
![](https://img.xkw.com/dksih/QBM/2016/2/22/1572490248880128/1572490255147008/STEM/bb3f2ac0177544c38c9d26c5cce79ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1857eadd6b23a87a1a5b4ffff584efd9.png)
![](https://img.xkw.com/dksih/QBM/2016/2/22/1572490248880128/1572490255147008/STEM/9e4ed8d00be74edea4f7669d98f68663.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99063370e8d256bdb55d37bd8c69513e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a76f52ae3ef071a5084d09ec035c80c.png)
(2)求三棱锥
![](https://img.xkw.com/dksih/QBM/2016/2/22/1572490248880128/1572490255147008/STEM/2946d26860c94bce82ffa4a31478f469.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2016/2/22/1572490248880128/1572490255147008/STEM/160840761184465198a8fc91a4ac1c54.png)
您最近一年使用:0次
6 . 如图所示的多面体中,四边形
是菱形、
是矩形,
面
,
.
![](https://img.xkw.com/dksih/QBM/2018/6/17/1969253939298304/2001732264640512/STEM/2bc02c24fc45494d8201d6e62651ec0a.png?resizew=217)
(1)求证:平面
平面
;
(2)若
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a38e6c6dfde2b19b6b47f35a439a06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb8fb552b9e21dbaba74d11aa747790.png)
![](https://img.xkw.com/dksih/QBM/2018/6/17/1969253939298304/2001732264640512/STEM/2bc02c24fc45494d8201d6e62651ec0a.png?resizew=217)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9c6944008168646d5f71fe3a930b0c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a9b32570d553161be04d13954e92a1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7307a23176550cded02f4e9a6e2ca014.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d48c65f7bcba6ef884d2884a9e7c1489.png)
您最近一年使用:0次
2016-12-03更新
|
4629次组卷
|
11卷引用:2014届广东省韶关市高三调研测试文科数学试卷
(已下线)2014届广东省韶关市高三调研测试文科数学试卷(已下线)2013-2014学年广东省执信中学高二下学期期中文科数学试卷(已下线)2013-2014学年广东省梅州市重点中学高二下学期期中文科数学试卷(已下线)2015届广东省惠州市高三第一次调研考试文科数学试卷(已下线)2015届广东省揭阳一中、潮州金山中学高三上学期暑假联考文科数学试卷(已下线)2015届河南省名校高三上学期期中文科数学试卷广东省广州市海珠区2018届高三综合测试(一)数学文试题【全国省级联考】黑龙江省2018年普通高等学校招生全国统一考试仿真模拟(二)数学(文科)试题新疆奎屯市第一高级中学2018-2019学年高二下学期第一次月考数学(文)试题山东省滨州市邹平一中2018-2019学年高一下学期3月月考数学试题重庆市江津中学2020-2021学年高二上学期第二次阶段性考试数学试题
解题方法
7 . 如图,几何体
中,
为边长为
的正方形,
为直角梯形,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2016/12/9/1579072308756480/1579072309313536/STEM/405a5a97932d45afa79885eeef6f23f3.png?resizew=205)
(1)求证:
;
(2)求几何体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fc1129846f37afdafd751627c450d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0e5697eca3f5205cb7b343648240bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb476b0dac9799c720354d30b3a85c9.png)
![](https://img.xkw.com/dksih/QBM/2016/12/9/1579072308756480/1579072309313536/STEM/405a5a97932d45afa79885eeef6f23f3.png?resizew=205)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac5867254f6e74a3e31237279cd481f6.png)
(2)求几何体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fc1129846f37afdafd751627c450d5.png)
您最近一年使用:0次