((2a^3-2b^3)/(3a+3b))*((15a^2-15b^2)/(a^2+ab+b^2))

Question

((2a^3-2b^3)/(3a+3b))*((15a^2-15b^2)/(a^2+ab+b^2))

Answer 1

((2a^3-2b^3)/(3a+3b))*((15a^2-15b^2)/(a^2+ab+b^2))=(2(a^3-b^3)*15(a^2-b^2))/(3(a-b)(a^2+ab+b^2))=(30(a^2-b^2))/3=10(a^2-b^2)=10a^2-10b^2

Comments

Большое спасибо