设A=1+3/2+5/4+7/8+9/16+11/32+13/64
2A=2+3+5/2+7/4+9/8+11/16+13/32
2A-A=4+2/2+2/4+2/8+2/16+2/32
A=4+1+1/2+1/4+1/8+1/16=5+1/2+1/4+1/8+1/16+1/16-1/16
=5+1/2+1/4+1/8+1/8-1/16
=5+1/2+1/4+1/4-1/16
=5+1/2+1/2-1/16
=6-1/16
=95/16
设A=1+3/2+5/4+7/8+9/16+11/32+13/64
2A=2+3+5/2+7/4+9/8+11/16+13/32
2A-A=4+2/2+2/4+2/8+2/16+2/32
A=4+1+1/2+1/4+1/8+1/16=5+1/2+1/4+1/8+1/16+1/16-1/16
=5+1/2+1/4+1/8+1/8-1/16
=5+1/2+1/4+1/4-1/16
=5+1/2+1/2-1/16
=6-1/16
=95/16