2011·山西·一模
1 . 给出下列命题:
①函数
的图象关于点
对称;
②若向量
满足
且
,则
;
③把函数
的图象向右平移
得到
的图象;
④若数列
既是等差数列又是等比数列,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb3097d314618108b5166bc4b1f94e7b.png)
其中正确命题的序号为.
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fffa8ddcbbe89ab0f250f56673e2d36c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05ae9f3646b83e0bba521e6106923eec.png)
②若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96022a881e03e32d3483d997c3f170c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe14a3defd365e0ae637c18b51ff647b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb536b9f4f5295a76bd54ca39499877c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecc49e0ce40eb3e997119f80198c5d22.png)
③把函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33522ab6c7c4af036de962a083df267a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c8ae071199874d9d74a4919a58902f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c191fdfd08fb94ba6ed45c71f0fbeb.png)
④若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb3097d314618108b5166bc4b1f94e7b.png)
其中正确命题的序号为.
A.①③④ | B.①④ | C.③④ | D.①② |
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