1 . (1)用综合法证明:已知a,b,c都是实数,
;
(2)用分析法证明:对于任意a,
,都有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/718baee4ebadc334bb21aa4898ee72b9.png)
(2)用分析法证明:对于任意a,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e57e3aae0913a02658df0f67ba8c126c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dd5fc9df715d87bb7646d066f845563.png)
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2022-07-15更新
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145次组卷
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2卷引用:广西河池市2021-2022学年高二下学期期末考试数学(文)试题
2 . (1)设x>0,y>0,且x+y=1,求证
.
(2)已知a>0,b>0,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128294be1f10b83df30ad60d4c696224.png)
(2)已知a>0,b>0,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8f3bf714dcba0fcc8483f0fa0f3d64f.png)
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解题方法
3 . (1)设a、b是两个不相等的正数,若
,证明:
.
(2)已知
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f00f997ae12c30f551adb834e1d7ef8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5d2a320b9ff137ce3632296c4b1d79a.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b6c5526947e9bef051bc3bdf7fd186d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b1411bbc505b5056e68e077d18e06b.png)
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4 . 已知
,用分析法证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/548a7ead1ccc51b2264c56b915ea3b0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f564b810f85a0b2f4b70a9a0f4ed0af8.png)
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5 . 用适当的方法证明下列不等式:
(1)若
,
,证明:
;
(2)设a,b是两个不相等的正数,且
,证明:
.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1cebd1251c1a7258367fc4c3542e240.png)
(2)设a,b是两个不相等的正数,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f00f997ae12c30f551adb834e1d7ef8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5d2a320b9ff137ce3632296c4b1d79a.png)
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6 . 求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08aa802a1d0c58bfb9e8ef42e6d5c0af.png)
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2017-07-26更新
|
192次组卷
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2卷引用:广西桂林市2020-2021学年高二下学期期末数学(文)试题
7 . 已知
,且
.
(Ⅰ)求
的最大值;
(Ⅱ)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/364d18c7009e307b1bea2e365d598ece.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/546965d452e9247212bda0a91aff0526.png)
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