设
是复数,则以下命题中的真命题的个数是( )
①若
,则
②若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b52f2f1d82f80ebf2ce497e0c5f029.png)
③若
,则
④若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bae527610c6b137cd499d78b657eac5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d860cb86e1467ac24010aecfc7a425.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab8d0bbf2ce16017069e4bbc69f9e431.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9de59a6da1ee210ccf04651ae53275dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e13d477ec252f1952efd7d97425bf40c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b52f2f1d82f80ebf2ce497e0c5f029.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e37c64fc12b438809bc6d723f359cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/540e6ea86af8a3560fd2d0311be405b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e37c64fc12b438809bc6d723f359cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bae527610c6b137cd499d78b657eac5f.png)
A.1 | B.2 | C.3 | D.4 |
更新时间:2020-11-12 23:30:49
|
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单选题
|
较易
(0.85)
【推荐1】下列命题中,说法正确的是
A.命题“若x2=1,则x=1”的否命题为“若x2=1,则x≠1” |
B.“0<x<![]() |
C.命题“∃x0∈R,使得x02+x0+1<0”的否定是:“∀x∈R,均有x2+x+1>0” |
D.命题“在△ABC中,若A>B,则sinA>sinB”的逆否命题为真命题 |
您最近一年使用:0次
单选题
|
较易
(0.85)
解题方法
【推荐2】已知
,下列三个命题:①
,
,②
,
,③
,
.其中是真命题的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56991507b188d1265b397080c907e252.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e81b4aac721bcd4a49593b48a28a8f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/285164c70abdf8b73e40e556c6cd6b98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cfe951c0b4ddd9d007a147bef01a0c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4a7310580794b8c7ab3f99a2c57b1d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8834da9d4ee61b171ed90e69a9a197d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96c13ecec9d1e4255714c1edc0617da1.png)
A.①③ | B.②③ | C.①② | D.①②③ |
您最近一年使用:0次