x*(x - 3)*(x + 1)
(x*(x - 3))*(x + 1) при x = 4
(x*(x - 3))*(x + 1)
((4)*((4) - 3))*((4) + 1)
(4*(4 - 3))*(4 + 1)
20
x*(1.0 + x)*(-3.0 + x)
3 2 x - 3*x - 2*x