综合法证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/275164b046b3945f199a601459f94c1e.png)
11-12高二下·山东济南·阶段练习 查看更多[1]
(已下线)2011-2012学年山东省济南世纪英华实验学校高二3月月考文科数学试卷
更新时间:2016-12-01 18:12:41
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【推荐2】已知
,
,
均为正实数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(Ⅰ)用分析法证明:≤
;
(Ⅱ)用综合法证明:若=1,则
≥8.
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【推荐1】已知
证明
.(请用两种不同的方法证明,其中必须有分析法)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7c9a562cac656df149fa4a32fc2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3de4c01049e3457c3e97f008459b921a.png)
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【推荐2】(1)若
,证明:
.
(2)已知
,
,
,
,试证明a,b,c至少有一个不小于1.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b162ff5b8a1ca4b0e934dbb1b2fed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3513efc9a14792e1fe9fa3ff5888d396.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab560cdc1f2fff8483e64235774d2aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/512670a2a8ffebb9ca69d4b75ec16de1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/033e0d9d0fcdfde98da36c30556ce240.png)
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