Ответ: (2x-y-3)^2+(x-3y-1)^2 = (2x-y-3)*(2x-y-3) + (x-3y-1)*(x-3y-1) = (4x^2 — 2xy — 6x -2xy+ y^2 + 3y — 6x + 3y + 9) + (x^2 — 3xy — x -3xy + 9y^2 +3y — x + 3y + 1) = 5x^2 -14x + 10y^2 + 12y — 10xy + 10
Источник znanija.site
Ответ: (2x-y-3)^2+(x-3y-1)^2 = (2x-y-3)*(2x-y-3) + (x-3y-1)*(x-3y-1) = (4x^2 — 2xy — 6x -2xy+ y^2 + 3y — 6x + 3y + 9) + (x^2 — 3xy — x -3xy + 9y^2 +3y — x + 3y + 1) = 5x^2 -14x + 10y^2 + 12y — 10xy + 10
Источник znanija.site