下列4个命题:
①“如果
,则
、
互为相反数”的逆命题
②“如果
,则
”的否命题
③在
中,“
”是“
”的充分不必要条件
④“函数
为奇函数”的充要条件是“
”
其中真命题的序号是_________ .
①“如果
![](https://img.xkw.com/dksih/QBM/2015/5/18/1572111192023040/1572111197511680/STEM/de4da69f7b0f4513935e16836db9a47e.png?resizew=63)
![](https://img.xkw.com/dksih/QBM/2015/5/18/1572111192023040/1572111197511680/STEM/d011f540ce394e87851436579061fb36.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2015/5/18/1572111192023040/1572111197511680/STEM/d675508c833c44fe8481ff71f4d79f61.png?resizew=15)
②“如果
![](https://img.xkw.com/dksih/QBM/2015/5/18/1572111192023040/1572111197511680/STEM/85e93ca38b5f4069ba47c6949e914d0e.png?resizew=92)
![](https://img.xkw.com/dksih/QBM/2015/5/18/1572111192023040/1572111197511680/STEM/a54479fbedf74bce9b9b88b6c67df621.png?resizew=39)
③在
![](https://img.xkw.com/dksih/QBM/2015/5/18/1572111192023040/1572111197511680/STEM/e7847b51483c4e1d9040fd618077ce2d.png?resizew=45)
![](https://img.xkw.com/dksih/QBM/2015/5/18/1572111192023040/1572111197511680/STEM/c6c6b6d121af48e89270563132193126.png?resizew=53)
![](https://img.xkw.com/dksih/QBM/2015/5/18/1572111192023040/1572111197511680/STEM/b85aa061c9e54c57b60cf9356c9e34c9.png?resizew=64)
④“函数
![](https://img.xkw.com/dksih/QBM/2015/5/18/1572111192023040/1572111197511680/STEM/7336b5d3b9e24f8ea47de6821dc8bb68.png?resizew=117)
![](https://img.xkw.com/dksih/QBM/2015/5/18/1572111192023040/1572111197511680/STEM/2f8d3844bdce4a5daa70bc0c7afe3e81.png?resizew=97)
其中真命题的序号是
14-15高二上·河南·期中 查看更多[4]
(已下线)2014-2015学年河南省实验中学高二上学期期中考试文科数学试卷2014-2015学年河南省柘城县高中高二上学期期中考试文科数学试卷(已下线)同步君人教A版选修2-1第一章1.2.2 充要条件高中数学人教版 选修2-1(理科) 第一章 常用逻辑用语 1.2.2 充要条件
更新时间:2016-12-03 13:31:19
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适中
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【推荐1】设
是两个非零平面向量,则有:
①若
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②若
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③若
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④若存在实数
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四个命题中真命题的序号为 __________ .(填写所有真命题的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
①若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/057cdb4057bca398a838e868efd360f5.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/057cdb4057bca398a838e868efd360f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3ad3804e4f44287aba1f7ac94cb1d2.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3ad3804e4f44287aba1f7ac94cb1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d89ba3bbb4a838cd12182ecf5115693e.png)
④若存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d89ba3bbb4a838cd12182ecf5115693e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1cfae5fc8be936b22913d8d919793c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea8b77feab6f4c5480d0349d48b774b9.png)
您最近一年使用:0次
填空题-单空题
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【推荐2】以下命题中:
①从匀速传递的产品生产流水线上,质检员每20分钟从中抽取一件产品进行某项指标检测,这样的抽样是分层抽样.
②由y=3sin2x的图象向右平移
个单位长度可以得到函数f(x)=3sin(2x
)的图象.
③在回归直线方程
0.2x+12中,当变量x每增加一个单位时,变量
增加0.2单位.
④设0<x
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其中假命题是 (将你认为是假命题的序号都填上)
①从匀速传递的产品生产流水线上,质检员每20分钟从中抽取一件产品进行某项指标检测,这样的抽样是分层抽样.
②由y=3sin2x的图象向右平移
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65af1d6b6b831ebbdc36dda5f304a3a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4eaa60bbd4c9040b7194492fc661f83.png)
③在回归直线方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66f445d679591a01f9dd62faef0c0f4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b3eeef2332076c169746d04eebce03.png)
④设0<x
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其中假命题是 (将你认为是假命题的序号都填上)
您最近一年使用:0次