(1-1/2²)(1-1/3²)(1-1/4²)……*(1-1/2008²)
=(1-1/2)(1+1/2)(1-1/3)(1+1/3)·····(1-1/2008)(1+1/2008)
=1/2x3/2x2/3x4/3x3/4x5/3x···x2007/2008x2009/2008
=1/2x2009/2008
=2009/4016
(1-1/2²)(1-1/3²)(1-1/4²)……*(1-1/2008²)
(1-1/2²)(1-1/3²)(1-1/4²)……*(1-1/2008²)
數(shù)學(xué)人氣：375 ℃時(shí)間：2020-01-29 22:57:51
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