Question

(a-b)^2-(a-c)^2 разложить

Answer 1

$(a-b)^2-(a-c)^2=a^2-2ab+b^2-(a^2-2ac+c^2)=$$a^2-2ab+b^2-a^2+2ac-c^2=2ab-b^2-2ac+c^2$