已知1/(n×(n+1))=1/n-1/(n+1)且1/2+1/6+1/12+……+1/(n(n+1))=1993/1994求n。0a8^2]'p
算式:提示'A.D9x5`8F0S*}(G3g+a5z+E-~3T4y0a8^2]'p
答:n=/Z'A2I;i7s-d6k(j;h'Y6h3[0a8^2]'p