已知函数f(x)=log
2(x+m),且f(0),f(2),f(6)成等差数列.
(1)求m的值;
(2)若a,b,c是两两不相等的正数,且a,b,c成等比数列,试比较f(a)+f(c)与2f(b)的大小.
考点分析:
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设M是
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225040683955083/SYS201311012250406839550015_ST/0.png)
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的最小值是
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已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225040683955083/SYS201311012250406839550014_ST/0.png)
,且关于x的方程
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有实根,则
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与
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等差数列{a
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