1 . 给出下列命题:①若
,则
;②若
,则
是纯虚数;③若
、
,且
,则
;④若
,则
对应的点在复平面内的第一象限,其中正确命题的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/255483db09b1e523a4fcc1f618b98ec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61a3363aaa23cf3d6e1a0a637e29ba64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/875bad31a6b330660cce9acb60a8f47b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d285a4c557fc9748105b62ccd94b7859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f47f2009bcbf3cb4906e4e7e969ad87b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1c36e5c7a7b9f386dbcadd5bbb572d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62bee3bbef602b12f783c95616a35aa7.png)
A.1 | B.2 | C.3 | D.4 |
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2 . 下列结论中,正确的是( )
A.若![]() ![]() ![]() ![]() |
B.若复数![]() ![]() ![]() ![]() |
C.若![]() ![]() |
D.若实数![]() ![]() ![]() ![]() |
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