3/4+3/16+3/64+3/256+3/1024+3/4096=

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3/4+3/16+3/64+3/256+3/1024+3/4096=

3/4+3/16+3/64+3/256+3/1024+3/4096=
3/4+3/16+3/64+3/256+3/1024+3/4096=

3/4+3/16+3/64+3/256+3/1024+3/4096=
3/4+3/16+3/64+3/256+3/1024+3/4096
=3/4*[1-(1/4)^6]/(1-1/4)
=4095/4096
或者
3/4+3/16+3/64+3/256+3/1024+3/4096
=3072/4096+768/4096+192/4096+48/4096+12/4096+3/4096
=4095/4096