已知函数
.
(1)求
的值域;
(2)设函数
,若对于任意
,总存在
,使得
成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be4852d14e77fdcafed17cc01e8f6626.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0e82df2694221f17d57df5ef469f4da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fecff4475e063dfcb5d64e542a20ef12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28cc3046743d423289a7afbe20ea1cc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/982f44059061490f50329f7e71aa0dad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2016-12-04 20:34:58
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解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐1】已知函数
.
(1)当
,且
时,求
的取值范围;
(2)是否存在正实数a,
,使得函数
在
上的取值范围是
.若存在,则求出a,b的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5663c187aa4e5fdfd1dd28895872ce37.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e14206c7d228a7c2259a7b27da8813.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aba934874cc9f2ab272fdff67ea23bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82e9085aa49e1771ddcd9c327aba486b.png)
(2)是否存在正实数a,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f9fcab2886322d40bb5b52d997984fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c80c2b55996f6735f5089581f632672.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】给定正实数
,对任意的正整数
,
,其中
表示不超过实数
的最大整数.
1.若
,求
的取值范围;
2.求证:(i)
;
(ii)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba72a9bd4cffb5dbea68f3cc05c95c53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
1.若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/062c6026df79d335604d21223ba13c50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
2.求证:(i)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c69a414069ff1d5fc16594f7231aba4e.png)
(ii)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22789db88931d4f2a22b67b9794cfd7f.png)
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适中
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【推荐1】已知f(x)=求f(f(x))≥1的解集.
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解答题-证明题
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适中
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名校
解题方法
【推荐2】已知函数
.
(1)求证:对于任意的
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(2)记函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be315e528951120e7d551f654d2a1f5e.png)
(1)求证:对于任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365114c53aa12abda1004c8e4cb4ca0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ab1e0be6a47685179838e4578930972.png)
(2)记函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f71b5d629555e9717a57bd20227448c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2aa311daf7a73f8c45de4462f9d92b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d5408842cf8095d3b0a4e1bef10226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d5408842cf8095d3b0a4e1bef10226.png)
您最近一年使用:0次