名校
解题方法
1 . 对下列命题:
(1)若命题
,则命题![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aed598e8d3f64d994c6be400a01f8e29.png)
(2)
的最小值为4;
(3)
是各项均为正数的等比数列,则
是等差数列;
(4)
,且
是锐角,则实数的取值范围为
;
其中所有正确命题的序号为___________ (填出所有正确命题的序号).
(1)若命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f97848955a36d41def3a1c31115cb93a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aed598e8d3f64d994c6be400a01f8e29.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92764eb4fd255796e92c2c4db5909efc.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dc71a2fd8c6b263feea5ff5d6a36121.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33b5d531efd6be7ffc145c9c6597afab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfaf8279481e31e730f866dd047f9224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a891eb0f07654c6dda4380b2fae38e8a.png)
其中所有正确命题的序号为
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