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1/3+1/6+1/12+1/24+1/48+1/96+1/192+1/384=?
人气:301 ℃ 时间:2020-01-22 20:37:05
解答
=1/3(1+1/2+1/4+1/8+1/16+1/32+1/64+1/128)
=1/3(1-1/256)×2
=85/128
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