填空题-单空题 适中0.65 引用4 组卷968
下列4个命题:
①“如果
,则
、
互为相反数”的逆命题
②“如果
,则
”的否命题
③在
中,“
”是“
”的充分不必要条件
④“函数
为奇函数”的充要条件是“
”
其中真命题的序号是_________ .
①“如果
![](https://img.xkw.com/dksih/QBM/2015/5/18/1572111192023040/1572111197511680/STEM/de4da69f7b0f4513935e16836db9a47e.png?resizew=63)
![](https://img.xkw.com/dksih/QBM/2015/5/18/1572111192023040/1572111197511680/STEM/d011f540ce394e87851436579061fb36.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2015/5/18/1572111192023040/1572111197511680/STEM/d675508c833c44fe8481ff71f4d79f61.png?resizew=15)
②“如果
![](https://img.xkw.com/dksih/QBM/2015/5/18/1572111192023040/1572111197511680/STEM/85e93ca38b5f4069ba47c6949e914d0e.png?resizew=92)
![](https://img.xkw.com/dksih/QBM/2015/5/18/1572111192023040/1572111197511680/STEM/a54479fbedf74bce9b9b88b6c67df621.png?resizew=39)
③在
![](https://img.xkw.com/dksih/QBM/2015/5/18/1572111192023040/1572111197511680/STEM/e7847b51483c4e1d9040fd618077ce2d.png?resizew=45)
![](https://img.xkw.com/dksih/QBM/2015/5/18/1572111192023040/1572111197511680/STEM/c6c6b6d121af48e89270563132193126.png?resizew=53)
![](https://img.xkw.com/dksih/QBM/2015/5/18/1572111192023040/1572111197511680/STEM/b85aa061c9e54c57b60cf9356c9e34c9.png?resizew=64)
④“函数
![](https://img.xkw.com/dksih/QBM/2015/5/18/1572111192023040/1572111197511680/STEM/7336b5d3b9e24f8ea47de6821dc8bb68.png?resizew=117)
![](https://img.xkw.com/dksih/QBM/2015/5/18/1572111192023040/1572111197511680/STEM/2f8d3844bdce4a5daa70bc0c7afe3e81.png?resizew=97)
其中真命题的序号是
14-15高二上·河南·期中
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