1 . 如图,在直三棱柱
中,平面
侧面
,且
.
![](https://img.xkw.com/dksih/QBM/2016/3/1/1572508766109696/1572508772605952/STEM/9b83dc6e25ee48d7975690c9b755fc49.png)
(1)求证:
;
(2)若
,求锐二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d7e638ee7e910e4dd7fec67b9b75da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b7b7793d29d66dfdd89e7a6564a35c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4339a40ae9d1947ec3a4b3e2fa3a16cd.png)
![](https://img.xkw.com/dksih/QBM/2016/3/1/1572508766109696/1572508772605952/STEM/9b83dc6e25ee48d7975690c9b755fc49.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af254745c1c19bd20e83344bee674ce7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c14a66ed4bd66df65bc42c4ac1ed15c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c127b47353581fe4626d55345a5cb4eb.png)
您最近一年使用:0次
2 . 如图,在四棱锥
中,
平面
;四边形
是菱形,经过
作与
平行的平面交
与点
,
的两对角线交点为
.
求证:
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6153163fecdf3f410411048428ccaef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e458f4503e211b542f6f30c8a34eaca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfc5c0771b501da459f1a12e8f1ebe72.png)
![](https://img.xkw.com/dksih/QBM/2015/8/7/1572205463117824/1572205468975104/STEM/c22d8c8a031340b1afc37b01ee5f5c77.png)
您最近一年使用:0次
3 . 三棱柱
的直观图及三视图(正视图和俯视图是正方形,侧视图是等腰直角三角形)如图所示,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2015/3/24/1572021623480320/1572021629509632/STEM/eedc4df3b8e04c58b6c9b8fb8d0ae369.png)
![](https://img.xkw.com/dksih/QBM/2015/3/24/1572021623480320/1572021629509632/STEM/f3073629bc6c4d579648e2b1ea658377.png)
(1)求证:
平面
;
(2)求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2015/3/24/1572021623480320/1572021629509632/STEM/eedc4df3b8e04c58b6c9b8fb8d0ae369.png)
![](https://img.xkw.com/dksih/QBM/2015/3/24/1572021623480320/1572021629509632/STEM/f3073629bc6c4d579648e2b1ea658377.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3da59ed9a8bc1877e5c7d00560fb703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf9628142422a4884bd59538da6d312.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e58cab0a5fbdc54bd8f01a1659e17987.png)
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4 . 如图,在四棱锥
中,底面
为直角梯形,AD‖BC,
,平面
⊥底面
,Q为AD的中点,M是棱PC上的点,PA=PD=AD=2,BC=1,CD=
.
![](https://img.xkw.com/dksih/QBM/2016/4/6/1578863833063424/1578863833620480/STEM/db3f1d2c4eeb42f9929d3a5005b6e66f.png)
(Ⅰ)求证:平面PQB⊥平面PAD;
(Ⅱ)若二面角M-BQ-C为
,设PM=t
MC,试确定t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6153163fecdf3f410411048428ccaef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf94d9e7788382c5f9060e60f100e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2016/4/6/1578863833063424/1578863833620480/STEM/db3f1d2c4eeb42f9929d3a5005b6e66f.png)
(Ⅰ)求证:平面PQB⊥平面PAD;
(Ⅱ)若二面角M-BQ-C为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f7408f4e5fbc936c79089b25ecb1cce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b18d78c40ce368f60208949c5ae3fb.png)
您最近一年使用:0次
2016-12-03更新
|
645次组卷
|
4卷引用:2015届广东省惠州市高三4月模拟理科数学试卷
5 . 如图,四棱锥
中,底面
为平行四边形,
底面
,
是棱
的中点,
且
.
![](https://img.xkw.com/dksih/QBM/2017/9/2/1765395891019776/1766284314329088/STEM/8d6d454cd5a04b7cb0322403aa363d9e.png?resizew=220)
(1)求证:
平面
;
(2)如果
是棱
上一点,且直线
与平面
所成角的正弦值为
,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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/890c5b938c7a39a891faeaac4d77aee8.png)
![](https://img.xkw.com/dksih/QBM/2017/9/2/1765395891019776/1766284314329088/STEM/8d6d454cd5a04b7cb0322403aa363d9e.png?resizew=220)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf2f0df53aa68c9c334165034788166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64e76a4c1e5934f51cdca2ffbc8313f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2d109733379365295b93c58769d2019.png)
您最近一年使用:0次
2016-12-13更新
|
1590次组卷
|
4卷引用:【校级联考】广东省汕头市达濠华侨中学,东厦中学2019届高三上学期第三次联考数学(理)试题
6 . 如图所示,在长方体ABCD﹣A1B1C1D1中,BC=2AB=4,
,E是A1D1的中点.
![](https://img.xkw.com/dksih/QBM/2016/8/17/1572981576130560/1572981581651968/STEM/7b90cd6e-b4db-430b-9c5e-7f2b760f3d10.png)
(Ⅰ)在平面A1B1C1D1内,请作出过点E与CE垂直的直线l,并证明l⊥CE;
(Ⅱ)设(Ⅰ)中所作直线l与CE确定的平面为α,求点C1到平面α的距离.
![](https://img.xkw.com/dksih/QBM/2016/8/17/1572981576130560/1572981581651968/STEM/88393b58260c4ae9a3db11dabca11181.png)
![](https://img.xkw.com/dksih/QBM/2016/8/17/1572981576130560/1572981581651968/STEM/7b90cd6e-b4db-430b-9c5e-7f2b760f3d10.png)
(Ⅰ)在平面A1B1C1D1内,请作出过点E与CE垂直的直线l,并证明l⊥CE;
(Ⅱ)设(Ⅰ)中所作直线l与CE确定的平面为α,求点C1到平面α的距离.
您最近一年使用:0次
7 . 如图,长方体
中,
,
,点E是线段AB中点.
证明:
;
求二面角
的大小的余弦值;
求A点到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd694ad3a4733c7c84aaa7946aeea4de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95db5d71f0d7cdb83e2b6bb25cea42b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7fa3aea72ccc36948a4a90f7368f71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62191bcb4f06ed7667c470207a91cf8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dbeb4e8eeb288b3cabb5c30b6af473b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557b79c2a9bc8321629c1d1c8bcf74c2.png)
![](https://img.xkw.com/dksih/QBM/2019/1/17/2120854487957504/2123462368133120/STEM/d75b15a0cba84c2b984465ee7f16dbb7.png?resizew=199)
您最近一年使用:0次
2016-12-03更新
|
987次组卷
|
2卷引用:2014-2015学年广东省揭阳市三中高二下学期第一次段考理科数学试卷
8 . 如图,在三棱锥
中,
,∠ACB=90°,侧面
为等边三角形,侧棱
.
![](https://img.xkw.com/dksih/QBM/2016/8/3/1572950095380480/1572950101630976/STEM/864aba4443da435d9f7ef0f795ef21bf.png?resizew=192)
(Ⅰ)求证:
;
(Ⅱ)求证:平面PAB⊥平面
;
(Ⅲ)求二面角
的余弦值.
![](https://img.xkw.com/dksih/QBM/2016/8/3/1572950095380480/1572950101630976/STEM/51cff678414d4c2ead3da54d7ead8c87.png?resizew=60)
![](https://img.xkw.com/dksih/QBM/2016/8/3/1572950095380480/1572950101630976/STEM/b955bbc11e174293b12f5ea8a6b349c7.png?resizew=95)
![](https://img.xkw.com/dksih/QBM/2016/8/3/1572950095380480/1572950101630976/STEM/cf7607dbc8d3463f84a9d239460a264f.png?resizew=35)
![](https://img.xkw.com/dksih/QBM/2016/8/3/1572950095380480/1572950101630976/STEM/07a320938e9a4c278854a6ad4dd82ee7.png?resizew=73)
![](https://img.xkw.com/dksih/QBM/2016/8/3/1572950095380480/1572950101630976/STEM/864aba4443da435d9f7ef0f795ef21bf.png?resizew=192)
(Ⅰ)求证:
![](https://img.xkw.com/dksih/QBM/2016/8/3/1572950095380480/1572950101630976/STEM/ddaef9387bb74310a296a8b9ed59fe67.png?resizew=62)
(Ⅱ)求证:平面PAB⊥平面
![](https://img.xkw.com/dksih/QBM/2016/8/3/1572950095380480/1572950101630976/STEM/2536f3feeab34ea79d0179f1db96b3b7.png?resizew=37)
(Ⅲ)求二面角
![](https://img.xkw.com/dksih/QBM/2016/8/3/1572950095380480/1572950101630976/STEM/bcb965000a0d49a1b96e78b91ee56675.png?resizew=74)
您最近一年使用:0次
9 . 如图,在直三棱柱ABC-A1B1C1中,
,点E、F、G分别是AA1、AC、BB1的中点,且CG⊥C1G.
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572500601774080/1572500607582208/STEM/3a36b77999f041fc8e6a3f7688599870.png)
(1)求证:CG//面BEF;
(2)求证:面BEF⊥面A1C1G.
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572500601774080/1572500607582208/STEM/0317b8fb26364973a26b6eb5ccab664e.png)
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572500601774080/1572500607582208/STEM/3a36b77999f041fc8e6a3f7688599870.png)
(1)求证:CG//面BEF;
(2)求证:面BEF⊥面A1C1G.
您最近一年使用:0次
10 . 如图,空间四边形ABCD中,
,
,
分别是AB,BC,CD的中点,求证:
![](https://img.xkw.com/dksih/QBM/2015/8/14/1572214065676288/1572214071500800/STEM/d9a0ed54d4b04d87aad1b69eabcc3966.png)
(1)AC∥平面
;
(2)BD∥平面
.
![](https://img.xkw.com/dksih/QBM/2015/8/14/1572214065676288/1572214071500800/STEM/626a80080fec4f7cb6214724161f3531.png)
![](https://img.xkw.com/dksih/QBM/2015/8/14/1572214065676288/1572214071500800/STEM/a91ad33ea4aa428f8ceb12305cd207ca.png)
![](https://img.xkw.com/dksih/QBM/2015/8/14/1572214065676288/1572214071500800/STEM/59a2cb39baa64285a2fe43bbc21a8608.png)
![](https://img.xkw.com/dksih/QBM/2015/8/14/1572214065676288/1572214071500800/STEM/d9a0ed54d4b04d87aad1b69eabcc3966.png)
(1)AC∥平面
![](https://img.xkw.com/dksih/QBM/2015/8/14/1572214065676288/1572214071500800/STEM/0afbdbf470f24626b0f8c80a7021e4b1.png)
(2)BD∥平面
![](https://img.xkw.com/dksih/QBM/2015/8/14/1572214065676288/1572214071500800/STEM/0afbdbf470f24626b0f8c80a7021e4b1.png)
您最近一年使用:0次