Question

СРОЧНООООООООО!!!!!!!!!!!!!!!

Answer 1

Ответ:

1)

$(3m - n)(9m^2 + 3mn + n^2) = 3m * 9m^2 + 3m * 3mn + 3m * n^2 - n * 9m^2 - n * 3mn - n * n^2$

$27m^3 + 9m^2n + 3mn^2 - 9m^3 - 3m^2n - n^3$

$(27m^3 - 9m^3) + (9m^2n - 3m^2n) + 3mn^2 - n^3$

$18m^3 + 6m^2n + 3mn^2 - n^3$ - упростили

Вiдповiдь: $8m^3 + 6m^2n + 3mn^2 - n^3$

2)

$(7a^2 - 2ab - b^2)(3a + 2b) = 7a^2 * 3a + 7a^2 * 2b - 2ab * 3a - 2ab * 2b - b^2 * 3a - b^2 * 2b$

$21a^3 + 14a^2b - 6a^2b - 4ab^2 - 3ab^2 - 2b^3$

$(21a^3 - 6a^2b) + (14a^2b - 6a^2b) + (-4ab^2 - 3ab^2) - 2b^3$

$21a^3 + 8a^2b - 7ab^2 - 2b^3$ - упростили

Вiдповiдь: $21a^3 + 8a^2b - 7ab^2 - 2b^3$

Answer 2

Объяснение:

1) (3m-n)(9m²+3mn+n²)=27m³-9m²n+9m²n-3mn²+3mn²-n³=27m³-n³

2) (7a²-2ab-b²)(3a+2b)=21a³-6a²b-3ab²+14a²b-4ab²-b³=

=21a³+8a²b-7ab²-2b³