(X+Y)(X-Y) (N-M)(n+m) даю 30 баллов

Question

(X+Y)(X-Y) (N-M)(n+m) даю 30 баллов

Answer 1

(X+Y)(X-Y) = X²-XY+YX-Y²

(N-M)(n+m) = Nn + Nm - Mn - Mm