这题很简单,an/(2^n)是一个首相为a1/2=2/2=1公差为3/2的等差数列.,所以an/(2^n)=3/2n-1/2,所以an=2^n(3/2n-1/2).
数列题:a1=2,当n>=2时,an/2^n=an-1/2^n-1+3/2
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