1 . 定义函数
,
,其中
,符号
表示数
中的较大者,给出以下命题:
①
是奇函数;
②若不等式
对一切实数
恒成立,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ad6aed46a20a642a1715ec6c095d637.png)
③
时,
最小值是2450
④“
”是“
”成立的充要条件
以上正确命题是__________ .(写出所有正确命题的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c33a2b3e49d97efe77cf2347971772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be362dec96173f246ff747264007817.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53ad6b511253288bb1a39cf30a82e644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
②若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ff8a27243f951c34c4bf49e4671cd09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ad6aed46a20a642a1715ec6c095d637.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2d642e5b82f541e2369b44f7243365f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad54140b7691e8b6ef343201175fde6.png)
④“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c328c9c4ec69c4275e27576fb61655.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e801cb6a3687aa06380932a8ba7837.png)
以上正确命题是
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2018-12-24更新
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5卷引用:湖南省益阳市桃江县2018-2019学年高二下学期期末数学(理)试题