1/5-1/10-1/20-1/40-1/80-1/160简算
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1/5-1/10-1/20-1/40-1/80-1/160简算
1/5-1/10-1/20-1/40-1/80-1/160简算
1/5-1/10-1/20-1/40-1/80-1/160简算
1/5-1/10-1/20-1/40-1/80-1/160
=(160/5-16-8-4-2-1)/160
=(32-16-8-4-2-1)160
=1/160