问题描述:
数学等比数列前n项和 紧急紧急!
数列an满足(1/2)*a1+(1/2^2)*a2+(1/2^3)*a3+...+(1/2^n)*an=5+2n,求an
数列an满足(1/2)*a1+(1/2^2)*a2+(1/2^3)*a3+...+(1/2^n)*an=5+2n,求an
问题解答:
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