Odpowiedź:
(a +2) x 6a= 6a^{2} + 12a
(6a^{2} + 12a) :3 = 2a^{2} + 4a
(2a^{2} + 4a) x 5b = 10a^{2}b + 20ab
(10a^{2}b + 20ab) : (-2) = -5a^{2}b - 10ab
(a + 2) x (-5ab) = -5a^{2}b - 10ab
