(1+2分之1)*(1-2f分之1)*(1+3分之1)*(1-3分之1)……(1+100分之1)*(1-100分之1)
=(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)(5/4)……(99/100)(101/100)
=(1/2)(101/100)
=101/200
200分之101
(1+2分之1)*(1-2f分之1)*(1+3分之1)*(1-3分之1)……(1+100分之1)*(1-100分之1)
=(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)(5/4)……(99/100)(101/100)
=(1/2)(101/100)
=101/200
200分之101