1 . 给出下列命题:
①若向量
共线,则向量
所在的直线平行;
②若向量
所在的直线为异面直线,则向量
一定不共面;
③已知空间的三个向量
,则对于空间的任意一个向量
,总存在唯一实数
,使得
.
其中正确命题的个数是( )
①若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c16fea1d48964587131e3e09b2a33b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c16fea1d48964587131e3e09b2a33b.png)
②若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c16fea1d48964587131e3e09b2a33b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c16fea1d48964587131e3e09b2a33b.png)
③已知空间的三个向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27e2b694fa1584587e4f1ba3bbc26eae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1399e10bbd24ec48d84e31744388432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02b87b8fe02993aac5687c9d4df3b3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a143546e6eb9af1d51ac499f920150d5.png)
其中正确命题的个数是( )
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2 . 有以下命题:
①如果向量
,
与任何向量不能构成空间向量的一组基底,那么
,
的关系是不共线;
②
,
,
,
为空间四点,且向量
,
,
不构成空间的一个基底,则点
,
,
,
一定共面;
③已知向量
,
,
是空间的一个基底,则向量
,
,
也是空间的一个基底.
其中正确的命题是( )
①如果向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20ec3efaa6b6ff5769e8999df5714a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
③已知向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b91254db5ff748150f449c5cdd256c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1c1dd6b13d92f2cc2eef097e14c07c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
其中正确的命题是( )
A.② | B.① | C.③ | D.①②③ |
您最近一年使用:0次