2 3*x + 4*x*y - 4*x*(x + y)
3*x^2 + (4*x)*y - 4*x*(x + y) при y = 2
3*x^2 + (4*x)*y - 4*x*(x + y)
3*x^2 + (4*x)*(2) - 4*x*(x + (2))
3*x^2 + (4*x)*2 - 4*x*(x + 2)
3*x^2 + 8*x - 4*x*(2 + x)
2 3*x - 4*x*(x + y) + 4*x*y
3.0*x^2 + 4.0*x*y - 4.0*x*(x + y)
2 -x