求证 2/(3-1)+2/(3^2-1)+2/(3^3-1)+……+2/(3^n-1)<3/2求证 2/(3-1)+2/(3^2-1)+2/(3^3-1)+……+2/(3^n-1)<3/2 是放缩还是数学归纳?我都弄不出

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求证 2/(3-1)+2/(3^2-1)+2/(3^3-1)+……+2/(3^n-1)<3/2求证 2/(3-1)+2/(3^2-1)+2/(3^3-1)+……+2/(3^n-1)<3/2 是放缩还是数学归纳?我都弄不出
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求证 2/(3-1)+2/(3^2-1)+2/(3^3-1)+……+2/(3^n-1)<3/2求证 2/(3-1)+2/(3^2-1)+2/(3^3-1)+……+2/(3^n-1)<3/2 是放缩还是数学归纳?我都弄不出
求证 2/(3-1)+2/(3^2-1)+2/(3^3-1)+……+2/(3^n-1)<3/2
求证 2/(3-1)+2/(3^2-1)+2/(3^3-1)+……+2/(3^n-1)<3/2 是放缩还是数学归纳?我都弄不出

求证 2/(3-1)+2/(3^2-1)+2/(3^3-1)+……+2/(3^n-1)<3/2求证 2/(3-1)+2/(3^2-1)+2/(3^3-1)+……+2/(3^n-1)<3/2 是放缩还是数学归纳?我都弄不出

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