Пожалуйста, прошу помогите:(
Упростите выражения:)
Даю 11 б
1) (a+1)(a^2-a+1)-a^3=
2) (x+y)(x^2-xy+y^2)-x(x^2+y^2)=
3) (m-2)(m^2+2m+4)+8=
4) (c+3)(c^2-3c+9)-27=
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