十八题

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十八题
十八题
 

十八题
=(1-1/2)(1+1/2)(1-1/3)(1+1/3)(1-1/4)(1+1/4)……(1-1/100)(1+1/100)
=(1/2)(3/2)(2/3)(4/3)(3/4)……(99/100)(101/100)
=(1/2)(101/100)
=101/200

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