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共回答了19个问题采纳率:84.2% 举报
1/2+3/4+7/8+15/16+31/32+127/128+255/256
解,得:
==1/2+(1-1/4)+(1-1/8)+(1-1/16)+(1-1/32)+(1-1/128)+(1-1/256)
==1/2+1-1/4+1-1/8+1-1/16+1-1/32+1-1/128+1-1/256
==6+1/2-(1/4+1/8)-(1/16+1/32)-(1/128+1/256)
==6+1/2-3/8-3/32-3/256
==6+1/8-3/32-3/256
==6+1/32-3/256
==6+5/256
==6又5/256
1年前
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