Автор - porhun2006

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Ответ

Автор - st0roz

2.)1+3x+x^2 - 2x + 2x^2 - x =3x^2 + 1

3.)3my - 2ny - 9m+ 6n = y * (3m - 2n) – 3*(3m - 2n)=

(3m - 2n) * (y – 3)

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