Sn = 2^(1/2)-2^(1/1) + 2^(1/3)-2^(1/2) + . +2^(1/n)-2^【1/(n-1】+ 2^[1/(n+1)]-2^(1/n)
= -2^(1/1) + 2^[1/(n+1)]
则lim(n→无穷大)Sn= -1
Sn = 2^(1/2)-2^(1/1) + 2^(1/3)-2^(1/2) + . +2^(1/n)-2^【1/(n-1】+ 2^[1/(n+1)]-2^(1/n)
= -2^(1/1) + 2^[1/(n+1)]
则lim(n→无穷大)Sn= -1