如图,三棱柱
中,
平面
,
,
是棱
的中点,
.
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/3eac007c7c2341f983675ad1f8fb06b3.png)
(1)证明:
;
(2)设
,
的中点为
,求点
到平面
的距离.
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/6abd7cfc6b6046d893e3e8fb3e7896d3.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/ab581c4b8d4541bab1f2de5f3dd8316d.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/4a5ced8cd5e34789ae570eeac7e1c3d1.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/7abf7fb9f09d482eb7b701f43e5d5b66.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/29cdece757b64f27b32e9052201c60c9.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/da7e61a5d8ac4698aec6e7fa9a7536fe.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/6d76d786a2a24d85be5acfafafea59bb.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/3eac007c7c2341f983675ad1f8fb06b3.png)
(1)证明:
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/f4d027f4aadc4a479068148a96ee4eb6.png)
(2)设
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/ee0ea0770d2c4b828941ac2cb879eb1b.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/12c63870f4774be3b4c5eb065bfad062.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/814dfa17f4274df293ea236a2651fc7c.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/814dfa17f4274df293ea236a2651fc7c.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/7348dcb74ded4b40b1b338eccc293299.png)
更新时间:2016-12-04 02:50:11
|
相似题推荐
解答题
|
适中
(0.64)
【推荐1】如图,
是底面边长为2,高为
的正三棱柱,经过AB的截面与上底面相交于PQ, 设
.
![](https://img.xkw.com/dksih/QBM/2016/12/2/1573195541856256/1573195547467776/STEM/eefd24043f7b4674bbd665c46109fdbc.png)
(Ⅰ)证明:
;
(Ⅱ)当
时,求点C到平面APQB的距离.
![](https://img.xkw.com/dksih/QBM/2016/12/2/1573195541856256/1573195547467776/STEM/8013be2f4635409c85f739a60c554614.png)
![](https://img.xkw.com/dksih/QBM/2016/12/2/1573195541856256/1573195547467776/STEM/f74f72a98fac459b983679881bcf99cc.png)
![](https://img.xkw.com/dksih/QBM/2016/12/2/1573195541856256/1573195547467776/STEM/363c485d616b43b88154c92580ce8d51.png)
![](https://img.xkw.com/dksih/QBM/2016/12/2/1573195541856256/1573195547467776/STEM/eefd24043f7b4674bbd665c46109fdbc.png)
(Ⅰ)证明:
![](https://img.xkw.com/dksih/QBM/2016/12/2/1573195541856256/1573195547467776/STEM/588f244dc3ed46b7993c6afa66f7a480.png)
(Ⅱ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.64)
【推荐2】 如图(1)所示,在梯形
中,
,
,且
,如图(2)沿
将四边形
折起,使得平面
与平面
垂直,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2015/11/9/1572282277666816/1572282282975232/STEM/5cf3a4a7b7674fceaa0a36466d4baaa4.png)
(1) 求证:平面
平面
;
(2) 求三棱锥
的体积.
(3)求二面角
的正切值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bba96f574e1ffb4af0f931fbdbebc2ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8bfce9792569027f18b420e22b7e4c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca62001f03424f892c0827ba05faec47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/2015/11/9/1572282277666816/1572282282975232/STEM/5cf3a4a7b7674fceaa0a36466d4baaa4.png)
(1) 求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3a65323d97bcc048600a61f6d87be7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8257b6bd25104e07b9ad935c0a3aac4.png)
(2) 求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fc008589cbc97064f05f40559b076b1.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52c6a66c2fdc8413ade331da6e8e33c9.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.64)
【推荐1】如图,长方体
中,
,
,点
是棱
上的一点,
.
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572933430534144/1572933436850176/STEM/0f2c0b4afc0e44fca8ab04b06dddd033.png)
(1)当
时,求证:
平面
;
(2)当直线
与平面
所成角的正切值为
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8456cee87c4e22351affc28f3a73a0f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe236a434aa88e5633ea61574d1bed8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b2724590d4b4bb700b531850aee68a.png)
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572933430534144/1572933436850176/STEM/0f2c0b4afc0e44fca8ab04b06dddd033.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab9746b5ac6f0ae29da26362170fb027.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3da59ed9a8bc1877e5c7d00560fb703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b0ec61018d883ea288c2ec406f2f79f.png)
(2)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b0ec61018d883ea288c2ec406f2f79f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5fffd330dd6b9241659d790bd2a7fb2.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.64)
【推荐2】如图,在四棱锥P-ABCD中,底面ABCD是边长为
的正方形,且PD=
,PA=PC=
.
(1)求证:直线PD⊥面ABCD;
(2)求二面角A-PB-D的大小.
![](https://img.xkw.com/dksih/QBM/2012/7/12/1570924353085440/1570924358377472/STEM/572e580aadd54d88832c2f27ec75e864.png)
![](https://img.xkw.com/dksih/QBM/2012/7/12/1570924353085440/1570924358377472/STEM/572e580aadd54d88832c2f27ec75e864.png)
![](https://img.xkw.com/dksih/QBM/2012/7/12/1570924353085440/1570924358377472/STEM/40906e379b564435aeca655f13c03607.png)
(1)求证:直线PD⊥面ABCD;
(2)求二面角A-PB-D的大小.
![](https://img.xkw.com/dksih/QBM/2012/7/12/1570924353085440/1570924358377472/STEM/2a62ace478544af7833ded8baeeb4fdc.png)
您最近一年使用:0次