公式:1/1*2+1/2*3+1/3*4 + ...+ 1/n(n+1) (n是一个很大的整数)
= 1-1/(n+1)
=n/(n+1)
原式 = (1-1/2)+(1/2 - 1/3) + (1/3 - 1/4) + ...+ (1/99 - 1/100)
= 1 - 1/100
=99/100
公式:1/1*2+1/2*3+1/3*4 + ...+ 1/n(n+1) (n是一个很大的整数)
= 1-1/(n+1)
=n/(n+1)
原式 = (1-1/2)+(1/2 - 1/3) + (1/3 - 1/4) + ...+ (1/99 - 1/100)
= 1 - 1/100
=99/100