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若(3a+5b)n的展开式的各项的系数之和为215,则n等于( ) A.5 B....
若(3a+5b)n的展开式的各项的系数之和为215,则n等于( )
A.5
B.6
C.15
D.16
考点分析:
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>1(n∈N
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