计算:(1-1/2²)(1-1/3²)(1-1/4²)×.×(1-1/99²)(1-1/100²)
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计算:(1-1/2²)(1-1/3²)(1-1/4²)×.×(1-1/99²)(1-1/100²)
计算:(1-1/2²)(1-1/3²)(1-1/4²)×.×(1-1/99²)(1-1/100²)
计算:(1-1/2²)(1-1/3²)(1-1/4²)×.×(1-1/99²)(1-1/100²)
通项 (n+1)(n-1)/n^2
写好以后前面和后面各约分最后得到 101/100*0.5=0.505