Упростить выражение 1/(n+1)!-1/(n+2)!
1/(n+1)!-1/(n+1)!*(n+2)=(n+2-1)/(n+1)!(n+2)=(n+1)/n!(n+1)(n+2)=1/n!*(n+2)
1/(n+1) - 1/(n+2) = (n+2) - (n+1) / (n+1) * (n+2) = n+2-n-1 / (n+1) * (n+2) = 1 / (n+1) * (n+2)