Question

помогите пожалуйста !!!!!!!!​

Answer 1

1)Г

2)В

3)А

$4) 1)(3 {m}^{2} - m) + (2m - 3) - ({m}^{2} - 3) =3 {m}^{2} - m + 2m - 3 + - {m}^{2} + 3 = 2 {m}^{2} + m \\ 2) - 2mn( {m}^{2} - 4mn + {n}^{2} ) = - 2 {m}^{3} n + 8 {m}^{2} {n}^{2} - 2m {n}^{3}$

$5)1)10 {x}^{2} - 15xy = 5x(2x - 3y) \\ 2)3a - 3b + ca - cb = 3(a - b) + c(a - b) = (3 + c)(a - b)$

6)(а+7)(а-4)-а(а+3)=a^2-4a+7a-28-a^2-3a=28