(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*.(1+1/9)*(1-1/9)

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(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*.(1+1/9)*(1-1/9)(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*.(1+1/9)*(1-1/9)(1+1

(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*.(1+1/9)*(1-1/9)
(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*.(1+1/9)*(1-1/9)

(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*.(1+1/9)*(1-1/9)
=(1-1/2)(1+1/2)(1-1/3)(1+1/3)……(1-1/9)(1+1/9)
=(1/2)(3/2)(2/3)(4/3)……(8/9)(10/9)
中间约分
=(1/2)(10/9)
=5/9