1 . 下列四个命题中真命题的个数是( )
①已知非零向量
,
,
,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5548846d7bc575235c60cd49b3cc7743.png)
②已知
,
是两个互相垂直的单位向量,若向量
与
的夹角为锐角,则k的取值范围是![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd50020c0e3198d4a6b2d26a413b1b8.png)
③已知向量
,
,则向量
在向量
上的投影向量为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16217f616b5123987dd2fdd53f4c7399.png)
④已知
,
,
,
可以作为平面向量的一组基底
①已知非零向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1afa49dbaa99a0d7a7a6d18b3fe42091.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bd5b976df5a24e2f106dc0e46bf8652.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5548846d7bc575235c60cd49b3cc7743.png)
②已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0411792b587ddd3e04440392f011c224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95d660852c5226ff65a21cfb36b8b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51dbf7fb9e71618bf5031f91c8d86b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a75d6886724cfe164028aa4d151aa98f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd50020c0e3198d4a6b2d26a413b1b8.png)
③已知向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75ee3423878ecb85894d02d79e7e08d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c904b8018fb826e890bb5503c952f40a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16217f616b5123987dd2fdd53f4c7399.png)
④已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/189a38f074b1d06034774eaeb7e489ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f6f144b47b7f6c8570782ab9c79e51c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0411792b587ddd3e04440392f011c224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95d660852c5226ff65a21cfb36b8b39.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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名校
2 . 已知命题
:“
,
”的否定是“
,
”;命题
:
,
.下列说法不正确的是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64bd5b0dac2c5208eab0f04f75557f3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a38e5a3df541f5f4911cfb23cf891ac1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7068575610f97e9ef54191dd2670b63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d8e95d03fb9d1c18c79f947ba629507.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b763aa9fa12125f166b4ebfe7edacbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40b406ff8e1affe46d3fdd889688755b.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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2021-10-15更新
|
812次组卷
|
6卷引用:天津市实验中学滨海学校2021-2022学年高三(黄南民族班)上学期期中理科数学试题
3 . 下列命题:①设A,B为两个集合,则“
”是“
”的充分不必要条件;②
,
;③“
”是“
”的充要条件;④
,代数式
的值都是质数.其中的真命题是________ .(填写序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2ad78dc8b8aed907b4fe9640c997454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ceb1f338fa60976229d7ec6531b626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35eac3ba2858adffcd1f8052cd795269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64713e05157d31d2fb54e3875a1f87a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a93c0412463cd2cacd401f61d10e2d4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a252bcc22540b44485125d23e04f93a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f99a78f0c009e143c7fd5465b3d8fd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aedd75663c317a11fc7031681114752.png)
您最近一年使用:0次