(a-b)²+(b-c)²+(c-a)²=

Question

(a-b)²+(b-c)²+(c-a)²=

Answer 1

Вроде так: a^2-2ab+b^2+b^2-2bc+c^2+c^2-2ac+c^2=2a^2-2ab+2b^2-2bc+2c^2-2ca