给出下列五个命题:
①当
时,有
;
②若
是锐角三角形,则
;
③已知
是等差数列
的前
项和,若
,则
;
④函数
与
的图像关于直线
对称;
⑤当
时,不等式
恒成立,则实数
的取值范围为
.
其中正确命题的序号为___________ .
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c385a8d88836f6cae1255d86c1b6d76a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d3d04194297b37727db116081a662e.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30c77720b8b287e64c5e840dcc8db528.png)
③已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/effdf8cadd1a54cb5e0f3a621dd4ea80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a68405af59395b5b557581b32f97a5ca.png)
④函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26efb9f32f6cb608753f9189c6b48644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c67f5cfce32b3ed37987a4baa430062.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
⑤当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1864b98153200f5929787295de2c1e38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e9bd06dbb60db9ef56db0d694505330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7b06647930e162809da06a1a72b9d9f.png)
其中正确命题的序号为
更新时间:2018-10-24 10:45:10
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【推荐1】函数f(x)的定义域为A,若
且
时总有
,则称f(x)为单函数,例如,函数f(x)=2x+1(x∈R)是单函数.下列命题:
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②函数f(x)=
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其中的真命题是________ .(写出所有真命题的序号)
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①函数f(x)=x2(x∈R)是单函数;
②函数f(x)=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/658e3d4cb05a3ba2df63d9b847413c51.png)
③若f(x)为单函数,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcc342b78b8c829d22ef5325354abed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33bd24e647a626899a243a3f3984f90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f27822887caad20f3a075ca2fb74155c.png)
④在定义域上具有单调性的函数一定是单函数.
其中的真命题是
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名校
【推荐2】已知函数
,给出下列四个命题:(1)
在定义域内是减函数;(2)
是非奇非偶函数;(3)
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对称;(4)
是偶函数且有唯一一个零点.其中真命题有___________ .
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