An=2n-1,求证1/s1+1/s2+1/s3+…+1/sn
问题描述:
An=2n-1,求证1/s1+1/s2+1/s3+…+1/sn
答
an=2n-1Sn = a1+a2+...+an = n^21/Sn = 1/n^2for n>=2,1/Sn
An=2n-1,求证1/s1+1/s2+1/s3+…+1/sn
an=2n-1Sn = a1+a2+...+an = n^21/Sn = 1/n^2for n>=2,1/Sn