Автор - lush2228

1) (m-4)(m+5)=
2) (3x-1)(2x+5)
3)(3b+2)(3b-2)

Ответ

Автор - katrinborovik

1) m^2+5m-4m-20 = m^2+m-20

2) 6x^2+15x-2x-5 = 6x^2+13x-5

3) 9b^2-6b+6b-4 = 9b^2-4

(^2 обозначает степень)

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