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已知函数f(x)=alog2x-blog3x+2,若f()=4,则f(2009)...
已知函数f(x)=alog
2x-blog
3x+2,若f(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212973654/SYS201310251237212129736012_ST/0.png)
)=4,则f(2009)的值为
.
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