计算:1/X(X+2)+1/(X+2)(X+4)+...+1/(X+28)(X+30)

问题描述:

计算:1/X(X+2)+1/(X+2)(X+4)+...+1/(X+28)(X+30)

1/2*[1/x-1/(x+2)+1/(x+2)-1/(x+4)......+1/(x+28)-1/(x+30)]
=1/2*[1/x-1/(x+30)]