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Автор - nakan3

упростите (x-3y)(x-3y)(x2+9y2)

Ответ

Автор - Юленька194

(x-3y)(x-3y)(x^2+9y^2)= (x-3y)^2(x^2+9y^2)=(x^2-6xy+9y^2)(x^2+9y^2)=x^4+9x^2y^2-6x^3y-54xy^3+9x^2y^2+81y^4

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