Question

Помогите срочно!!! Даю 30 баллов

Answer 1

Ответ:

$1)\ \ \boxed{\ \ }\cdot (0,6a^2c-4a^3c+ac^2)=-3a^4c^3+\boxed {\ \ }\\\\\boxed {\ -5a^2c^2\ }\cdot (0,6a^2c-4a^3c+ac^2)=-3a^4c^3+\boxed{\ +20a^5c^3-5a^3c^4\ }\\\\\\2)\ \ (3m^2n+\boxed{\ \ }-n^4)\cdot \boxed{\ \ }=6m^3n^5+8mn^6-\boxed{\ \ }\\\\ (3m^2n+\boxed{\ 4n^2\ }-n^4)\cdot \boxed{\ 2mn^4\ }=6m^3n^5+8mn^6-\boxed{\ 2mn^8\ }\\\\\\3)\ \ 4a^2b^3\cdot (\ \boxed{\ \ }\ )=16a^3b^3+28a^2b^4-2a^2b^3\\\\4a^2b^3\cdot (\ \boxed{\ 4a+7b-0,5\ }\ )=16a^3b^3+28a^2b^4-2a^2b^3$