1 . 有下列四个命题:
①“若
,则
互为相反数”的逆命题;
②“若
,则
”的否命题;
③“若
是无理数,则
都是无理数”的逆命题;
④“若
,则
”的逆否命题.
其中真命题的序号是__________ .
①“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f1a686b80b8f109a929f58c2de7201d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
②“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f7c54faca6eac8af5309942062058d.png)
③“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
④“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0973815df3264c67f94eccde1c279ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1dbe0d4a121e1b69c2ad3b14d25d1e5.png)
其中真命题的序号是
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2 . 下列命题错误的是
A.“若![]() ![]() ![]() ![]() ![]() ![]() |
B.若![]() ![]() |
C.命题“![]() ![]() ![]() ![]() |
D.“![]() ![]() |
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