1-2/1-4/1-8/1-16/1-32/1-64/1-128/1

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1-2/1-4/1-8/1-16/1-32/1-64/1-128/1
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1-2/1-4/1-8/1-16/1-32/1-64/1-128/1
1-2/1-4/1-8/1-16/1-32/1-64/1-128/1

1-2/1-4/1-8/1-16/1-32/1-64/1-128/1
应该是1-1/2-1/4-1/8-1/16-1/32-1/64-1/128吧!
=1/2-1/4-1/8-1/16-1/32-1/64-1/128
=1/4-1/8-1/16-1/32-1/64-1/128
=1/8-1/16-1/32-1/64-1/128
=1/16-1/32-1/64-1/128
=1/32-1/64-1/128
=1/64-1/128
=1/128

1-2/1-4/1-8/1-16/1-32/1-64/1-128/1
=1-（2/1+4/1+...+128/1）
=1-(2/1+2^2/1+2^3/1+...+2^7/1)
=1-2/1*(1-2^7/1)/(1-2/1)
=1-(1-2^7/1)
=2^7/1
=128/1