Ответ:45,6-×+11,2=40
56,8-×=40
×=56,8-40
×=16,8
x^2 - xy - 6y^2 =
x^2 + 2xy - 3xy - 6y^2 =
x(x+2y) - 3y(x+2y) =
(x-3y)(x+2y).