下列命题中正确命题的序号是______________ .
①若
,则
;
②设
,且
,则
的最大值为9;
③数列
首项为1,A、B、C三点共线,且
,则数列
为等差数列;
④对任意
,都有
的否定为:存在
,使得
.
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73967fb3754b3310115c0a7842200628.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aad4cc6621419241d985338a232e0ee.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077a31bd2b8e26c35bfd855e42b5d7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4741556c029b5811318746d837cf246.png)
③数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04d2e6afa229ddb1bfe9db632fffc194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
④对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17ba0e9e655b1dd185cd22b1aac0b81a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f07ad90ca228230b03f12eb48ee0c1d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b782032cf21db68b7191f56cceb8b.png)
更新时间:2021-05-04 07:41:54
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解题方法
【推荐1】已知三个不等式:①
,②
,③
,用其中两个作为条件,剩下的一个作为结论,则可组成______ 个真命题.
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您最近一年使用:0次
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【推荐2】下列命题中,假命题为________
①存在四边相等的四边形不 是正方形;
②命题“若
R,且
则
至少有一个大于1”的逆命题;
③命题“若
,则
或
”的否命题是“若
,则
或
”;
④如果一个命题的逆命题是真命题,那么这个命题的否命题也是真命题.
①存在四边相等的四边形
②命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/058fbc27ee9654d24ebda3d9e6991266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f340cf2f0c41440180006196425832.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
③命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94175aa75c6d0334cdb9e5b6c2242ade.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cf332febb84842b1f8c60b8834002ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f0e9c04402a0ffdaa25c3e3c82c7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d09b9fc9719ff6faf32254b9d48713.png)
④如果一个命题的逆命题是真命题,那么这个命题的否命题也是真命题.
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