Question

3x(x+ y+ c)-3y(x-y-c)-3c(x y-c)

Answer 1

3*y^2+(3*c-3*c*x)*y+3*x^2+3*c*x+3*c^2

Ответ 3*(y^2-c*x*y+c*y+x^2+c*x+c^2)