解题方法
1 . 设函数
定义在R上,对于任意实数
,恒有
,且当
时,![](https://img.xkw.com/dksih/QBM/2015/1/28/1571973006458880/1571973012127744/STEM/14521a189143480dbf4b967c7305136d.png)
(1)求证:
且当
时,![](https://img.xkw.com/dksih/QBM/2015/1/28/1571973006458880/1571973012127744/STEM/c7d94d0c20f242b68436b9bf4321eb95.png)
(2)求证:
在R上是减函数;
(3)设集合
,
,且
,求实数
的取值范围.
![](https://img.xkw.com/dksih/QBM/2015/1/28/1571973006458880/1571973012127744/STEM/1bfa5cae3b3a447481aecc2e2ce61df0.png)
![](https://img.xkw.com/dksih/QBM/2015/1/28/1571973006458880/1571973012127744/STEM/c6f9944a9eed4ef9a65416634e15e69f.png)
![](https://img.xkw.com/dksih/QBM/2015/1/28/1571973006458880/1571973012127744/STEM/e67dc393fda44dee9ad4c2e554ceee0a.png)
![](https://img.xkw.com/dksih/QBM/2015/1/28/1571973006458880/1571973012127744/STEM/26a373ca13fc4c49b9cb2684bb2057b6.png)
![](https://img.xkw.com/dksih/QBM/2015/1/28/1571973006458880/1571973012127744/STEM/14521a189143480dbf4b967c7305136d.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2015/1/28/1571973006458880/1571973012127744/STEM/f592b8a8f7014a39b2bd24554228916d.png)
![](https://img.xkw.com/dksih/QBM/2015/1/28/1571973006458880/1571973012127744/STEM/61910d17672b48ee8c6a8c21636eb71b.png)
![](https://img.xkw.com/dksih/QBM/2015/1/28/1571973006458880/1571973012127744/STEM/c7d94d0c20f242b68436b9bf4321eb95.png)
(2)求证:
![](https://img.xkw.com/dksih/QBM/2015/1/28/1571973006458880/1571973012127744/STEM/dbf8c38718904aa386bcff640fb2bda4.png)
(3)设集合
![](https://img.xkw.com/dksih/QBM/2015/1/28/1571973006458880/1571973012127744/STEM/6e4095abb4e44ff7b92135bae593b6aa.png)
![](https://img.xkw.com/dksih/QBM/2015/1/28/1571973006458880/1571973012127744/STEM/6ca6f97eadd04cb1b4e4badeeaca3331.png)
![](https://img.xkw.com/dksih/QBM/2015/1/28/1571973006458880/1571973012127744/STEM/f90fdf73295c405691e2b12e2a45f485.png)
![](https://img.xkw.com/dksih/QBM/2015/1/28/1571973006458880/1571973012127744/STEM/eb1ad517a88844a698109907927b14be.png)
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2012·江西·一模
解题方法
2 . 设集合
是满足下列两个条件的无穷数列
的集合:①
②
,其中
,
是与
无关的常数.
(1)若
是等差数列,
是其前
项的和,
,试探究
与集合
之间的关系;
(2)设数列
的通项为
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02d44492b51b0e08208fdc0d1707025.png)
,
的最小值为m,求m的值;
(3)在(2)的条件下,设
,求证:数列
中任意不同的三项都不能成为等比数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68f165a34038d89623948dbe0a669df0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5612ce06759d0f77ca029d10083f7d1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f13871f2cd7ce93261fdc44e8c238199.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cce224c28ca451c4f105dc3b077736cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d9ed566eb0653f0dd282c5ac78a918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02d44492b51b0e08208fdc0d1707025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)在(2)的条件下,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cf695d1a13b56f7dd519c5161e1f04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147952d82ff1784624d9b28b92243fab.png)
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3 . 已知命题
:对任意![](https://img.xkw.com/dksih/QBM/2015/10/20/1572261574967296/1572261581062144/STEM/b343120399af47e6858d8d4d4ceb05b8.png)
命题
:存在
,证明
是
的充分不必要条件
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572261574967296/1572261581062144/STEM/aa237801052e44d8a03fee560d8d7fc1.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572261574967296/1572261581062144/STEM/b343120399af47e6858d8d4d4ceb05b8.png)
命题
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572261574967296/1572261581062144/STEM/52460548ecdc407c8cd5a10da30558dd.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572261574967296/1572261581062144/STEM/2574924e40c14e8bbb777293388093cd.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572261574967296/1572261581062144/STEM/aa237801052e44d8a03fee560d8d7fc1.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572261574967296/1572261581062144/STEM/52460548ecdc407c8cd5a10da30558dd.png)
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