482. Выполните умножение: a) 4x * 7y; б) -8x * 5x³; в) 4/9 ab³ * 3/2 ab; г) x²y⁵ * (-6xy²); д) -0,6a²b * (-10ab²); е) -1/5 m³n⁴ * 5m²n³.

a) (4x cdot 7y = 4 cdot 7 cdot x cdot y = 28xy) б) (-8x cdot 5x^3 = -8 cdot 5 cdot x cdot x^3 = -40x^{1+3} = -40x^4) в) (\frac{4}{9}ab^3 cdot \frac{3}{2}ab = \frac{4 cdot 3}{9 cdot 2} cdot a cdot a cdot b^3 cdot b = \frac{12}{18}a^2b^4 = \frac{2}{3}a^2b^4) г) (x^2y^5 cdot (-6xy^2) = -6 cdot x^2 cdot x cdot y^5 cdot y^2 = -6x^{2+1}y^{5+2} = -6x^3y^7) д) (-0.6a^2b cdot (-10ab^2) = -0.6 cdot (-10) cdot a^2 cdot a cdot b cdot b^2 = 6a^3b^3) е) (\frac{-1}{5}m^3n^4 cdot 5m^2n^3 = \frac{-1}{5} cdot 5 cdot m^3 cdot m^2 cdot n^4 cdot n^3 = -1m^{3+2}n^{4+3} = -m^5n^7)