17-18高二·全国·课后作业
解题方法
1 . 如图,已知在正方体
中,
是
的中点,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/1bdbac10-ecb6-471b-b5e4-f7e81bd43ec2.png?resizew=164)
(1)问:向量
,
,
是否为共面向量?
(2)求
.
(3)写出平面
的一个法向量.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dfd4c4648dc52d0952c20f3978fadd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/1bdbac10-ecb6-471b-b5e4-f7e81bd43ec2.png?resizew=164)
(1)问:向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d507cbc45fbda1630807543d4e038bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa3d0a957db97f161340aafb4a0d912c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdf814115dc9fea36cc1b6cd2b293390.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45799d87470e2dfa4696451347af6e2f.png)
(3)写出平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
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2 . 若
是三个不共面向量,则向量
是否共面?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75d3f514f503178b82efae8b106421f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c2634a29ce3b7f103f9138185932464.png)
您最近一年使用:0次
3 . 设A,B,C及A1,B1,C1分别是异面直线l1,l2上的三点,而M,N,P,Q分别是线段AA1,BA1,BB1,CC1的中点.求证:M,N,P,Q四点共面.
您最近一年使用:0次
2016高二·全国·课后作业
4 . 如图,已知
、
、
、
、
、
、
、
、
为空间的
个点,且
,
,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2016/11/15/1836136229879808/1826268636012544/STEM/2022ebbeb0664162b3f84a7ed49038ac.png?resizew=167)
求证:(1)
、
、
、
四点共面,
、
、
、
四点共面;
(2)
;
(3)
.
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/c8fa5b04e30e48868fe132789b807597.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/3066e7be6d7c4c518443aac35ebc6fc5.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/b91007e2ea5e433e95db20f4365af044.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/97903bb1c17f421d99f9d22a60f06e1a.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/04d375abd23446d49614ae0320e80084.png?resizew=17)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/b5a2daa15b914c598c2eab346ad7223e.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/33f3cc1423584e0dbcb2758c3e25432d.png?resizew=17)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/0b593aab85fb4dbcb2ebdf05a19793da.png?resizew=17)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/855db6b1d0d84981842248c6e4474b0e.png?resizew=19)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/0dbdef66d115422081bc2e5a32f48d7c.png?resizew=12)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/847f57351bde4581abef8a8eca1c6630.png?resizew=72)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/c6b86275082f489cbaca3001edb878c6.png?resizew=74)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/cba340111acb4e49b35a90810589fa18.png?resizew=77)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/ae8730bc42424af6af4187c0829e1322.png?resizew=115)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/f1055c0362da4a4fbde3e599db2ebaeb.png?resizew=116)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/3ef175e21b1b4b148b88a747da214799.png?resizew=37)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/4f3b0d4465694c178a6a044b9be25f3a.png?resizew=42)
![](https://img.xkw.com/dksih/QBM/2016/11/15/1836136229879808/1826268636012544/STEM/2022ebbeb0664162b3f84a7ed49038ac.png?resizew=167)
求证:(1)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/3066e7be6d7c4c518443aac35ebc6fc5.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/b91007e2ea5e433e95db20f4365af044.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/97903bb1c17f421d99f9d22a60f06e1a.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/04d375abd23446d49614ae0320e80084.png?resizew=17)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/b5a2daa15b914c598c2eab346ad7223e.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/33f3cc1423584e0dbcb2758c3e25432d.png?resizew=17)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/0b593aab85fb4dbcb2ebdf05a19793da.png?resizew=17)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/855db6b1d0d84981842248c6e4474b0e.png?resizew=19)
(2)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/EXPLANATION/8fe0f5e54a904f04abfa0fdf835415be.png?resizew=68)
(3)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1826268635201536/1826268636012544/STEM/26aac0e0723242a8984e34736049ce88.png?resizew=76)
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