计算:(1-1/2²)X(1-1/3²)X(1-1/4²)X…X(1-1/2015²)×(1-1/2016²)帮帮我,太难了
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计算:
(1-1/2²)X(1-1/3²)X(1-1/4²)X…X(1-1/2015²)×(1-1/2016²)
=(1+1/2)×(1-1/2)×(1+1/3)×(1-1/3)×(1+1/4)×(1-1/4)×……×(1+1/2015)×(1-1/2015)×(1+1/2016)×(1-1/2016)
=(3/2×4/3×5/4×……×2016/2015×2017/2016)×(1/2×2/3×3/4×……×2014/2015×2015/2016)
=2017/2×1/2016
=2017/4032
(1-1/2²)X(1-1/3²)X(1-1/4²)X…X(1-1/2015²)×(1-1/2016²)
=(1+1/2)×(1-1/2)×(1+1/3)×(1-1/3)×(1+1/4)×(1-1/4)×……×(1+1/2015)×(1-1/2015)×(1+1/2016)×(1-1/2016)
=(3/2×4/3×5/4×……×2016/2015×2017/2016)×(1/2×2/3×3/4×……×2014/2015×2015/2016)
=2017/2×1/2016
=2017/4032
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