Question

化简数学公式a^3-b^3=_________________(a-b)^3=____________________

Answer 1

a^3-b^3=(a-b)(a^2+ab+b^2)

(a-b)^3=a^3+(-b)^3+3 a^2 (-b)+3a(-b)^2 =a^3-b^3-3 a^2 b+3a b^2

^_^