Question

Решите плииз. Срооочно

Answer 1

1.$3a(a - 1) - {a}^{2} = \ = 3 {a}^{2} - 3a- {a}^{2} = \ = 2 {a}^{2} - 3a$

Ответ : б.

2.

$2(x - 1) - 3x = 5(2 - x) \2x - 2 - 3x = 10 - 5x \ 2x - 3x + 5x = 10 - 2 \ 4x = 8 \ x = frac{8}{4} \ x = 2$

Ответ : б

3.

$3(a - 1)(a + 8) = \ = 3 times ( {a}^{2} + 8a - a - 8) = \ = 3 {a}^{2} + 24a - 3a - 24 = \ = 3 {a}^{2} + 21a - 24 : .$