Binomio:
(a + b) . (x + y) =
= a . (x + y) + b . (x + y )
= ax + ay + bx + by
Monomio:
axn · bxm = (a · b)xn +m
(5x2 y3 z) · (2 y2 z2) = 10 x2 y5 z3