和式1×1/2+4×1/4+7×1/8+...+(3n-2)×1/(2^n)

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和式1×1/2+4×1/4+7×1/8+...+(3n-2)×1/(2^n)
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和式1×1/2+4×1/4+7×1/8+...+(3n-2)×1/(2^n)
和式1×1/2+4×1/4+7×1/8+...+(3n-2)×1/(2^n)

和式1×1/2+4×1/4+7×1/8+...+(3n-2)×1/(2^n)