11-12高三上·福建厦门·阶段练习
解题方法
1 . 已知函数
(
是自然对数的底数)
(1)求
的最小值;
(2)不等式
的解集为P, 若
且
,求实数
的取值范围;
(3)已知
,且
,是否存在等差数列
和首项为
公比大于0的等比数列
,使数列
的前
项和等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db0107fb8d4cb3a9b6311fa639ca514b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f8ffb5afc3de70c4fcd054c492a6e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7729c3c3e86a2ee0c3f8edff8282178.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9c9f7fe82ce33779868c7e319a0133d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8c0eda754a9ad60eadc8eb1b83d0d06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74156327e5659301f391814605688899.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5344eadd4711db34e3f935aedd5fb270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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10-11高三·江西·阶段练习
2 . 已知函数f(x)=ex﹣x(e为自然对数的底数).
(1)求f(x)的最小值;
(2)不等式f(x)>ax的解集为P,若M={x|
}且M∩P≠∅求实数a的取值范围;
(3)已知n∈N+,且Sn=
,是否存在等差数列{an}和首项为f(1),公比大于0的等比数列{bn},使得a1+a2+…+an+b1+b2+…bn=Sn?若存在,请求出数列{an}、{bn}的通项公式.若不存在,请说明理由.
(1)求f(x)的最小值;
(2)不等式f(x)>ax的解集为P,若M={x|
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d483cb8ab26e44280ff863020d32120e.png)
(3)已知n∈N+,且Sn=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1940d14e1433dafc0ecef9c658c7b8e6.png)
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