给出下列四个命题:
函数
的一条对称轴是
;
函数
的图象关于点
对称;
若
,则
,其中
;
④函数
的最小值为
.
以上四个命题中错误的个数为____________ 个.
函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28a1a237dccdb2a8836e580a6b170203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b283eb08db6f602ede1ae542c5e3662.png)
函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd57ea26ad54a7381754ade671ef1ab4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47c1fad7af7df8e93160cf83788bec5c.png)
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34b147a09f9e682484ecbf74bf2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9251874d613ca71393335282dc8244e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99074f989e74d5ff306b4b7b7a379c1f.png)
④函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eec8787184d9bbb6174b5bad5d95fd38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
以上四个命题中错误的个数为
2019·河北·高考模拟 查看更多[1]
(已下线)【全国百强校】河北省衡水中学2019届高三上学期二调考试数学(文)试题
更新时间:2018-10-11 14:43:58
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①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
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【推荐3】关于函数
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的图象关于点
对称;
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在
内的增区间为
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的振幅为4,频率为
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4e90e31974d3166ad5e177c372359b.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb1a7edc9ddb0957593b7e2e93ce6db.png)
②方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0a73db674d29eae8f8921eff5944983.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d67c905086b0c25078b59c787372fc72.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95228c66257fdb082fbc371d06c1c6e8.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
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解题方法
【推荐2】已知函数
,现有下列四个命题:
①
的最小正周期为
;②曲线
关于点
对称;
③若
,则
;④若
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.
其中所有真命题的编号是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f42837ceb2d5943e7f598e8ccd074598.png)
①
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③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4af2315fc7f6a230c8f65053365e6f8a.png)
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