a) (-11x^2y cdot 0.3x^2y^2 = -11 cdot 0.3 cdot x^2 cdot x^2 cdot y cdot y^2 = -3.3x^4y^3).
б) (a^5b cdot (-ab^3c) = -1 cdot a^5 cdot a cdot b cdot b^3 cdot c = -a^6b^4c).
в) (4xy cdot (-x^2) cdot (-y^3) = 4 cdot (-1) cdot (-1) cdot x cdot x^2 cdot y cdot y^3 = 4x^3y^4).
г) (a^2x^5b cdot (-0.6axb^2) cdot (0.6a^2b^3) = a^2 cdot a cdot a^2 cdot x^5 cdot x cdot b cdot b^2 cdot b^3 cdot (-0.6) cdot 0.6 = -0.36a^5x^6b^6).