如图,在空间四边形
中,
为其对角线,
为
的重心.
(1)证明:
;
(2)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/334a5773c8d24f29ec3231075170e4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4634f175ede6167e89d12414f584284a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55dbdf40a17f762188ae27b06bf39f7a.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c091ff0d1064d4453caccaae25085d9f.png)
![](https://img.xkw.com/dksih/QBM/2018/12/12/2095238741164032/2095318258368512/STEM/d4a16c9a7fef4d06babdcbababe3e88f.png?resizew=124)
2018高二上·全国·专题练习 查看更多[5]
(已下线)2018年12月10日 《每日一题》理数人教选修2-1-空间向量的加减运算与数乘运算(已下线)2019年12月9日《每日一题》选修2-1理数-空间向量的加减运算与数乘运算(已下线)2019年12月15日《每日一题》选修2-1理数-每周一测(已下线)1.1.1 空间向量及其加减运算-2020-2021学年高二数学课时同步练(人教A版选择性必修第一册)(已下线)专题1.2 空间向量及其线性运算-重难点题型检测-2021-2022学年高二数学举一反三系列(人教A版2019选择性必修第一册)
更新时间:2018-12-12 18:38:49
|
【知识点】 空间向量及其加减运算
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】已知在正三棱锥P-ABC中,点M,N分别是线段AB,PC的中点,记
,
,
.
,
,
来表示向量
,
;
(2)若
,
,
两两垂直,求直线PM与BN所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68d9ac737639ad7ce99887f9ef07685c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20a9410ceb649e303910f8efe5f7531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbadd77fde781d924b14e6dc57505ccf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3722488cf68b05c22d3e6c0b4de6991.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350f162ee9aa08f4c9779481a5ef1025.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】如图所示,三棱柱
中,
分别是
上的点,且
,
.用空间向量解决如下问题:
(1)若
,证明:
;
(2)证明:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b8bcadc933925d568d89b6a1da40ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2d2e2b5a777b74742cd1767e2fa47e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca07492a4353d05ca6918115f92a720.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/5fb36547-a26e-4c5c-b83b-8b4d2028feb4.png?resizew=160)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/075ea25b67aa214559961898d76b3df4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eacc0e7474802ce634de6f55a3287115.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
您最近一年使用:0次