1 . 当
时,若不等式
对于不小于2的正整数n恒成立.则x的范围是.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c6b49d1cf045602437c90972cffbd0.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2018-12-15更新
|
161次组卷
|
2卷引用:2020年11月北京大学强基计划学科创新测评题数学试题
2 . 已知
,
,
都是定义在
上的函数.我们定义上的函数为
、
、
、
的最小值.则
的最大值等于__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b388e3467e861379f6d240f80e5ba340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddc833417345710524c29cf0d8a9384d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3e52b5838e283d0436127b86089ed40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bffc9c4bf9de4d804885955aff039ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/548636534994cd465dfc7bf7dd41505b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1e2de22cb8df73c6dd6e61139d8196.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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3 . 实数
、
、
、
满足
及
.那么
的最小值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe4371cd377170fc7e30c15fa8652a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c6f8f4ab0b3cc812331c26676df68ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b547cd3c898f7ff486ec0231f85b8c.png)
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4 . 实数
、
满足
.则
的最大值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d06338311e0628686929971c452cb867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c925be255ca736a53b24d13ddede1a86.png)
您最近一年使用:0次