1-1/3-1/9-1/27-1/81-1/243-1/729-1/21897
发布网友
发布时间：2024-03-30 14:26
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热心网友
时间：2024-04-11 16:07
=1-(1/3+1/9+1/27+1/81+1/243+1/729)
=1-{(1/3)*[1-(1/3)^6]/[1-(1/3)]
=1-[(728/729)/2]
=1-(364/729)
=365/729
