1 . 已知
是实数,则“
”是“
”的必要不充分条件.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4887473a8091e1ef53a169cc9f211e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3201ccd104031b7d6c3c877ede0a3a7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa4156bd468e5e77d107cd8073205e1.png)
您最近一年使用:0次
2 . “
”是“
”的必要不充分条件. ( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46c97e1082c4cead21fdbf6fdda10c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39cc033406da2cdd342308972c6701f1.png)
您最近一年使用:0次
3 . 在
中,“
”是“
”的充要条件. ( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf0b9b24c44f56961262b7ed05b5f0cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
您最近一年使用:0次