(1)已知x,y>0,且x+y>2.求证:
中至少有一个小于2;
(2)设a,b,c>0且不全相等,若abc=1,证明:a2(b+c)+b2(c+a)+c2(a+b)>6.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c07f0aced5b76fbb5464e7309de2d152.png)
(2)设a,b,c>0且不全相等,若abc=1,证明:a2(b+c)+b2(c+a)+c2(a+b)>6.
更新时间:2021-06-18 08:16:57
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适中
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【推荐1】(1)设
,用综合法证明:
;
(2)用分析法证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69373eddfe60489319bc35d2c45e6130.png)
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(2)用分析法证明:
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【推荐2】设a>0,b>0,2c>a+b,求证:
(1)c2>ab;
(2)
.
(1)c2>ab;
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dba85a9e0c7ecc82a5ad498e3c2c6ab9.png)
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【推荐1】已知
,
,
,
为实数.
(Ⅰ)证明:
;
(Ⅱ)若
,证明:
,
,
,
中至少有一个不大于1.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfaf4ea4fd6113685691c5d75e874e11.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18c5865fb6e706b9147aa50865cfbee0.png)
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【推荐2】求证:
(1)已知
,求证:
;
(2)已知a>0,b>0,且
,求证:
与
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(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae41b4ea7f44a8699f108def4a22ac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f4fa6828188864939832ab3c23197a.png)
(2)已知a>0,b>0,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7dec5f5ef4a53175966c1704ad8a15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/656cacf9b32ce8f718dcb50bc8994593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f678dde8a2f44b8eae985b11bf4b50.png)
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