Question

помогите как решать (a-b)^3+(b-c)^3-(a-c)^3=-3(a-b)(b-c)(a-c)?

Answer 1

a^3-3a^2b+3ab^2-3b^2c+3bc^2-c^3+a^3-3a^3c+3ac^2-c^3=2a^3-3a^2b+3ab^2-3b^2c+3bc^2-2c^3-3a^2c+3ac^3