关于
的方程
有两个不等实根,则实数
的取值范围是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c44b490ae8f6edcee86c4789ab3e8d71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
更新时间:2017-05-09 17:16:44
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【推荐1】已知函数
,若方程
有三个不相等的实数解,则实数a的取值范围为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22c5b5988876dc6e10cf9eca3fc33cc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1542ce83034144ffcfa273d7481bd7de.png)
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【推荐2】设函数
在R上存在导函数
,对任意的实数x都有
,当
时,
.若
,则实数a的取值范围是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724340d69477c0ec2418c392b22b1cab.png)
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【推荐1】已知函数
的定义域为[-1,5],部分对应值如下表,
的导函数
的图象如图所示,下列关于
的命题:
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/07a0711fd3364ccabd4dc971e524082c.png?resizew=167)
①函数
的极大值点为0,4;
②函数
在[0,2]上是减函数;
③如果当
时,
的最大值是2,那么
的最大值为4;
④当
时,函数
有4个零点.
其中正确命题的序号是__________ .
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/21d78f517a0e47bb91fb9516c46dc9ee.png?resizew=36)
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/d454bc1abd40426e86998926bad4d36f.png?resizew=36)
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/5ea22c337c294dffb2c7acb08fb1c12c.png?resizew=61)
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/21d78f517a0e47bb91fb9516c46dc9ee.png?resizew=36)
-1 | 0 | 4 | 5 | |
1 | 2 | 2 | 1 |
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/07a0711fd3364ccabd4dc971e524082c.png?resizew=167)
①函数
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/21d78f517a0e47bb91fb9516c46dc9ee.png?resizew=36)
②函数
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/21d78f517a0e47bb91fb9516c46dc9ee.png?resizew=36)
③如果当
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/63a13fd698694c7986959260129e81e4.png?resizew=64)
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/21d78f517a0e47bb91fb9516c46dc9ee.png?resizew=36)
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/4eb143cf86df4c829b2e7050a9524f86.png?resizew=9)
④当
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/00b1a3c5c8d848e4912ffdb4d81a575d.png?resizew=57)
![](https://img.xkw.com/dksih/QBM/2017/5/1/1677482773700608/1678545825923072/STEM/ebc48be908704f23ae6c0688acb6373a.png?resizew=84)
其中正确命题的序号是
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名校
【推荐2】若函数
只有一个极值点,则
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93d9c14e0298f144d35532ccdcaff7ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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解题方法
【推荐1】已知
均为非负数且
,则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a14c388e1e2e5a2ff1ccf6caffbee0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70635a0dbd52ac1e43d99aad971f8dae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b5df77c7d87cc9baaae985348631aec.png)
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【推荐2】若函数
有三个不同的零点,则实数
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60dd245957d851f910a9ebbafd421abe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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