1 строка:
4a * 5 = (4 * 5)a = 20a;
4a * 7b = (4 * 7)ab = 28ab;
$4a * 12a^2 = (4 * 12)a^{1 + 2} = 48a^3$;
$4a * 11ax = (4 * 11)a^{1 + 1}x = 44a^2x$.
2 строка:
12ab * 5 = (12 * 5)ab = 60ab;
$12ab * 7b = (12 * 7)ab^{1 + 1} = 84ab^2$;
$12ab * 12a^2 = (12 * 12)a^{1 + 2}b = 144a^3b$;
$12ab * 11ax = (12 * 11)a^{1 + 1}bx = 132a^2bx$.
3 строка:
$10ab^2 * 5 = (10 * 5)ab^2 = 50ab^2$;
$10ab^2 * 7b = (10 * 7)ab^{2 + 1} = 70ab^3$;
$10ab^2 * 12a^2 = (10 * 12)a^{1 + 2}b^2 = 120a^3b^2$;
$10ab^2 * 11ax = (10 * 11)a^{1 + 1}b^2x = 110a^2b^2x$.