г) 5√x4y3 ⋅ 3√x5y2 ;

г) $$5√x^4y^3 ⋅ 3√x^5y^2 = 5\sqrt[5]{x^4y^3} \cdot 3\sqrt{x^5y^2} = 5\sqrt[5]{x^4y^3} \cdot 3x\sqrt{xy^2} = 5\sqrt[5]{x^4y^3} \cdot 3xy = 15xy \sqrt[5]{x^4y^3}$$.

Ответ: $$15xy \sqrt[5]{x^4y^3}$$