用简便方法计算 (1-1/4)(1-1/9)(1-16)(1-1/25)...(1-1/10000)

问题描述:

用简便方法计算 (1-1/4)(1-1/9)(1-16)(1-1/25)...(1-1/10000)

(1-1/4)(1-1/9)(1-16)(1-1/25)...(1-1/10000)
=(1-1/2)(1+1/2)(1-1/3)(1+1/3)...(1-1/100)(1+1/100)
=(1/2)(3/2)(2/3)(4/3)(3/4)...(100/99)(99/100)(101/100)
=(1/2)(101/100)
=101/200