(4-x)*(4-x)*(1-x)=?
(2-x)*(-7-x)*(-4-x)=?
и почему
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(2-x)*(-7-x)*(-4-x)= (-14-2x+7x+x^2)*(-4-x)=(x^2+5x-14)(-4-x)=-4x^2-x^3-20x-5x^2+56+14x=-x^3-9x^2-6x+56