(1-1/2方)(1-1/3方)(1-1/4方)...(1-1/n方)求大神帮助

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(1-1/2方)(1-1/3方)(1-1/4方)...(1-1/n方)求大神帮助(1-1/2方)(1-1/3方)(1-1/4方)...(1-1/n方)求大神帮助(1-1/2方)(1-1/3方)(1-1

(1-1/2方)(1-1/3方)(1-1/4方)...(1-1/n方)求大神帮助
(1-1/2方)(1-1/3方)(1-1/4方)...(1-1/n方)求大神帮助

(1-1/2方)(1-1/3方)(1-1/4方)...(1-1/n方)求大神帮助
(1-1/2方)(1-1/3方)(1-1/4方)······(1-1/n方) =(1+1/2)(1-1/2)(1+1/3)(1-1/3)(1+1/4)(1-1/4)······(1+1/n)(1-1/n) =3/2*1/2*4/3*2/3*5/4*3/4*······(1+n)/n*(n-1)/n =(n+1)/(2n) 还有疑问么