Question

Aratati ca pt orice n, nr natural nenul , are loc egalitatea :1/n(n+1) - 1/(n+1)(n+2)=2/n(n+1)(n+2)

Answer 1

$\frac{ 1}{n(n+1)} - \frac{1}{(n+1)(n+2)}=\frac{n+2-n}{n(n+1)(n+2)}=\frac{2}{n(n+1)(n+2)}$

Answer 2

..............................