Question

Докажите тождество: ( m-n)2= ( n-m)2

Answer 1

(m-n)²=m²-2mn+n²
(n-m)²=n²-2nm+m²
m²-2mn+n²=n²-2nm+m²                  ⇒

(m-n)^2= ( n-m)6^2