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若(5+4x)n展开式中各项二项式系数之和为an,展开式中各项系数之和为bn,则...
若(5+4x)
n展开式中各项二项式系数之和为a
n,
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展开式中各项系数之和为b
n,则
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=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224525478465000/SYS201311012245254784650007_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224525478465000/SYS201311012245254784650007_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224525478465000/SYS201311012245254784650007_ST/4.png)
D.
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