a) -4x^5y^2 • 3x^4y^4 = -12x^(5+4)y^(2+4) = -12x^9y^6
б) (3x^2y^3)^2 = 3^2 • (x^2)^2 • (y^3)^2 = 9 • x^(2•2) • y^(3•2) = 9x^4y^6
a) -4x^5y^2 • 3x^4y^4 = -12x^(5+4)y^(2+4) = -12x^9y^6
б) (3x^2y^3)^2 = 3^2 • (x^2)^2 • (y^3)^2 = 9 • x^(2•2) • y^(3•2) = 9x^4y^6