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=1/6*(1+1/2+1/4+1/8+……+1/64+1/128+1/256)=1/6*(1+1/2+(1/2-1/4)+(1/4-1/8)+……+(1/32-1/64)+(1/64-1/128)+(1/128-1/256))=1/6*(1+1/2+1/2-1/256)=511/1536大概思路是這樣,你可以驗算一下,這種…
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