1／2+3／4+7／8+15／16+31／32+63／64
=6-(1/2+1/4+1/8+1/16+1/32+1/64)
=6-(32+16+8+4+2+1)/64
=6-63/64
=5又1/64
（1-1/2)+(1-1/4)+(1-1/8)+(1-1/16)+(1-1/32)+(1-1/64)
=6-(1/2+1/4+1/8+1/16+1/32+1/64)
=6-(1/2+1/4+1/8+1/16+1/32+1/64+1/64-1/64)
=6-(1/2+1/4+1/8+1/16+1/32+1/32-1/64)
=6-(1/2+1/4+1/8+1/16+1/16-1/64)
=6-(1/2+1/4+1/8+1/8-1/64)
=6-(1-1/64)
=6-63/64
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