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。.j._*G5m:{9}+r+j6S/C1Y;e5];T-p:R*r1L3x*^7i*Z
算式:提示*\7y){,X.j._*G5m:{9}+r+j6S/C1Y;e5];T-p:R*r1L3x*^7i*Z
答:n=8j1^9a.s/M.j._*G5m:{9}+r+j6S/C1Y;e5];T-p:R*r1L3x*^7i*Z