(x + 13y)² - (13x + y)² = (x + 13y - 13x - y)(x + 13y + 13x + y) =
= (- 12x + 12y)(14x + 14y) = - 12 * 14 * (x - y)(x + y) = - 168(x² - y²)
Объяснение:
(x+13y)²−(13x+y)²=((x+13y-(13x+y))·((x+13y+(13x+y)=(x+13y-13x-y)·(x+13y+13x+y)=(-12х+12у)·(14х+14у)
(x + 13y)² - (13x + y)² = (x + 13y - 13x - y)(x + 13y + 13x + y) =
= (- 12x + 12y)(14x + 14y) = - 12 * 14 * (x - y)(x + y) = - 168(x² - y²)
Объяснение:
(x+13y)²−(13x+y)²=((x+13y-(13x+y))·((x+13y+(13x+y)=(x+13y-13x-y)·(x+13y+13x+y)=(-12х+12у)·(14х+14у)