Question

a). Aratati ca 1/n-1/n+k=k/n(n+k) oricare ar fi n, k apartine de N

Answer 1

1/n-1/n+k=k/n (n+k)= simplificam cu n+k 1/n - simplificam cu n 1/n+k= n+k+n/n (n+k) = se taie n => k/n (n+k).