1 . 给出下列四个命题:①“若
,则a>b”的逆命题;②“
,使得
”的否定;③已知函数
的图象向右平移
个单位长度后得到函数
的图象,“函数
为偶函数”的充要条件是“
”;④在
中,“
”是“
”的充分不必要条件.其中为真命题的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c22b9d08cf536bbb76bce1b0f135772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2939abf9f1755ea304eeb1e73063cba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5cb4f9a54a37fa2cf503bc77eb67ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1460e4a1178391ab692aa0af66b915b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e9f49332bd7f58d3efb1035109e520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbb60c8c689819d191bb1aebd622b98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9146192606b1abda29b88e60542e70e.png)
A.②④ | B.①④ | C.③④ | D.②③ |
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2 . 下列结论正确的是 ( )
① “
”是“对任意的正数x,均有
”的充分非必要条件.
②随机变量
服从正态分布
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a7e6eb7eb7d9ac0648d245cd0ee481e.png)
③线性回归直线至少经过样本点中的一个.
④若10名工人某天生产同一零件,生产的件数是15,17,14,10,15,17,17,16,14,12,设其平均数为a,中位数为b,众数为c,则有![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aad8970425f3cd462faf827be59d5da.png)
![](https://img.xkw.com/dksih/QBM/2021/5/6/2715219199574016/2731405586137088/STEM/bc9f2fbceeba4c4eaaa170fcb53f7185.png?resizew=11)
① “
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dbf3703ab3910cb5f037d7ac292f044.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6297a6828d8e699c69788a8aad6535ad.png)
②随机变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73dc3ce64254dcb880bc7e380ffcc123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a7e6eb7eb7d9ac0648d245cd0ee481e.png)
③线性回归直线至少经过样本点中的一个.
④若10名工人某天生产同一零件,生产的件数是15,17,14,10,15,17,17,16,14,12,设其平均数为a,中位数为b,众数为c,则有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aad8970425f3cd462faf827be59d5da.png)
![](https://img.xkw.com/dksih/QBM/2021/5/6/2715219199574016/2731405586137088/STEM/bc9f2fbceeba4c4eaaa170fcb53f7185.png?resizew=11)
A.③④ | B.①② | C.①③④ | D.①④ |
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