已知a,b∈R+且a+b=1,那么下列不等式:①ab≤
;②ab+
≥
;③
+
≤
;④
+
≥2
中,正确的序号是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10402e4ddd0d323cc1ae83801ae976db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81383553dbb7a403a9bffa8b1db8e392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd6e571db2dd3ae1eed2db73706cdea5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5e1ca2eb60489b653f8b95d241eecfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba6c898e0f9cbc4f95d0b12eb166c650.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e051d14fd6a787387995331f5e6d026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/476163ae8bff995a4d33c367b6beab67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21292b8fb2717477bd4dd134ab13d390.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e051d14fd6a787387995331f5e6d026.png)
17-18高二·全国·单元测试 查看更多[1]
(已下线)第3章 章末检测-2018-2019版数学创新设计课堂讲义同步系列(苏教版必修5)
更新时间:2019-01-02 19:02:55
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为
上一点,
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为
上任一点,若
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的最小值是_____________ .
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