(1+1/5)(1+1/5²)(1+1/5∧4)……(1+1/5³²)
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(1+1/5)(1+1/5²)(1+1/5∧4)……(1+1/5³²)(1+1/5)(1+1/5²)(1+1/5∧4)……(1+1/5³²)
(1+1/5)(1+1/5²)(1+1/5∧4)……(1+1/5³²)
(1+1/5)(1+1/5²)(1+1/5∧4)……(1+1/5³²)
(1+1/5)(1+1/5²)(1+1/5∧4)……(1+1/5³²)
设S=(1+1/5)(1+1/5²)(1+1/5∧4)……(1+1/5³²)则
(1-1/5)S=(1-1/5)(1+1/5)(1+1/5²)(1+1/5∧4)……(1+1/5³²)
=(1-1/5²)(1+1/5²)(1+1/5∧4)……(1+1/5³²)
=(1-1/5^4)(1+1/5^4)……(1+1/5³²)
=.
=1-1/5^64
∴S=5(1-1/5^64)/4
=(5-1/5^63)/4