长方体
中,
,
,
为棱
的中点,
与
交于点
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85db2d22d920ef798624d832dc4632b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27db558e8db4c957654c8e5cecd2d2dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afef9a8fcf730bc2dcc7f88084a6b7a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e97fcdcfd6183b976a61ef3222c607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ecad355286188fd317939fa50f9555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554b3b4c5ce7aca81becc07ed4903736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b10f43da9f1f24a608401bcb2eef0d5a.png)
![](https://img.xkw.com/dksih/QBM/2016/7/12/1572917523578880/1572917529755648/STEM/c732e3911e5c4fc2914e3167891d8fed.png)
更新时间:2016-12-04 16:51:49
|
【知识点】 证明异面直线垂直
相似题推荐
解答题-问答题
|
较易
(0.85)
【推荐1】如图,在三棱柱ABC-A1B1C1中,已知AB⊥侧面BB1C1C,AB=BC=1,BB1=2,∠BCC1=60°.
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572495479947264/1572495486320640/STEM/4ce82c71-30ee-423b-a765-6de53c699d57.png)
(Ⅰ)求证:C1B⊥平面ABC;
(Ⅱ)设
(0≤λ≤1),且平面AB1E与BB1E所成的锐二面角的大小为30°,试求λ的值.
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572495479947264/1572495486320640/STEM/4ce82c71-30ee-423b-a765-6de53c699d57.png)
(Ⅰ)求证:C1B⊥平面ABC;
(Ⅱ)设
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572495479947264/1572495486320640/STEM/e1e2085ae685491ba586ce1b21fbc3b4.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐2】如图,三棱柱
中,
平面ABC,AB
BC , 点M , N分别为A1C1与A1B的中点.
![](https://img.xkw.com/dksih/QBM/2016/1/29/1572471708549120/1572471713939456/STEM/f741be8c65e24efab9c1ccbb293ced53.png)
(Ⅰ)求证:MN
平面BCC1B1;
(Ⅱ)求证:平面A1BC
平面A1ABB1.
![](https://img.xkw.com/dksih/QBM/2016/1/29/1572471708549120/1572471713939456/STEM/2a5db8f869634cd0a6f8caa33170aa26.png)
![](https://img.xkw.com/dksih/QBM/2016/1/29/1572471708549120/1572471713939456/STEM/696f2ae6e75b4346bf799f1128a37042.png)
![](https://img.xkw.com/dksih/QBM/2016/1/29/1572471708549120/1572471713939456/STEM/63804ed3693f4beb9f35ae1237437162.png)
![](https://img.xkw.com/dksih/QBM/2016/1/29/1572471708549120/1572471713939456/STEM/f741be8c65e24efab9c1ccbb293ced53.png)
(Ⅰ)求证:MN
![](https://img.xkw.com/dksih/QBM/2016/1/29/1572471708549120/1572471713939456/STEM/adb8aaf945be4c96a0521c8ef468b2cd.png)
(Ⅱ)求证:平面A1BC
![](https://img.xkw.com/dksih/QBM/2016/1/29/1572471708549120/1572471713939456/STEM/63804ed3693f4beb9f35ae1237437162.png)
您最近一年使用:0次