(1)已知正数a,b,
,满足
,求证
.
(2)若
时,不等式
恒成立,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751e274e9107d780c39ba9c49d6daefb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6378bad81af67364ba6ecd8b52196e6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3c31c1e80d9d0033050e83f93e19feb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feca08ca3e94335cb550e23e162a2566.png)
更新时间:2021-10-28 06:52:31
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解答题-问答题
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适中
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【推荐1】已知函数
.
当
时,若
恒成立,求a的取值范围;
当
时,若
恒成立,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20445074be47657ca5cd687f77ac51d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99970093312dd2dc9f00e450fe49420c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00d3cb32989478239d01af82dcd91964.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83a29726cb09e82862db881a3258c34b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eeb69a0798212da12726a08d02057bd.png)
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解答题-问答题
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【推荐2】已知三个关于x的不等式:①
;②
;③![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1989df0e78fb7aa068eddc3ce243ee04.png)
(1)分别求出①和②的解集;
(2)若同时满足①和②的x值也满足③,求m的取值范围;
(3)若同时满足③的x至少满足①和②的一个,求m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db0d387038c44cc1d35fb5fa691e8a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22f6de33ba956065bc510e3d4d92de5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1989df0e78fb7aa068eddc3ce243ee04.png)
(1)分别求出①和②的解集;
(2)若同时满足①和②的x值也满足③,求m的取值范围;
(3)若同时满足③的x至少满足①和②的一个,求m的取值范围.
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解答题-问答题
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适中
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【推荐1】已知a,b都是正数.
(1)若
,证明:
;
(2)当
时,证明:
.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b16d8a700655197df02e2f6c43fd8349.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3c64e201a305d19369c31186d318fe.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2958030ec9d7543dda1f529593a915e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0adda910b4cb356521622488b8a3a73.png)
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【推荐2】(1)若
,求证:
;
(2)利用(1)的结论,求下列问题:已知
,求
的最小值,并求出此时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1b31010c9feebf3cf2b291065dbd2b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a942dd2e94cc216504402d2a738958.png)
(2)利用(1)的结论,求下列问题:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af1df2a8b51ea0efaaec4d6f96742e34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c5a887316680998a06723ad1f877607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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解题方法
【推荐3】定义域均为
的奇函数
与偶函数
满足
.
(1)求函数
与
的解析式;
(2)证明:
;
(3)试用
,
,
,
表示
与
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67cdfc25230a9090d17cf9a33096d4c7.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f733d752c847a35d2a4b89c2cc8b5db.png)
(3)试用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/915b3d29d0c7dd83c188e3ce31f52fc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be22faef62e7a035eb39a2e020c880e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02aafb75784feb9472d46adab1e939a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3ec8f79b42db17aff3a207f371156ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a22a60d110a8453ede0f9db2c2c41ff3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/498ff336812fb70d580666b6538ffa62.png)
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