Question

(x+y)(x2-xy+y?)– x(x2+y^);
(c+3)(c2–3c+9)-27.​

Answer 1

Если упростить то лови (x+y)(x^2-xy+y^2)-x (x^2+y^2)=х^3+y^3+x^3-xy^2=x^6+y^3-xy^2

(c+3)(c^2-3c+9)-27=c^3+9-27=c^3-18