1/2+1/4+1/8+1/16.+1/256
=（1-1/2）+（1/2-1/4)+(1/4-1/8)+(1/8-1/16).+(1/128-1/256)
=1-1/2+1/2-1/4++1/4-1/8+1/8-1/16+1/16-.-1/128+1/128-1/256
=1-1/256
=255/256
请问1/2+1/4+1/8+1/16.+1/256怎么简便算?谢谢!
3个回答
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