Ответ:

[tex]1)3 {m}^{2} - 6mn = 3m \times (m - 2n) \\ 2)3 {x}^{4} - 6 {x}^{3} + 9 {x}^{5} = 3 {x}^{2} \times ( {x}^{2} - 2x + 3 {x}^{3} ) \\ 3)3x \times (a - b) - 5y \times (a - b) = (a - b) \times (3x - 5y) \\ 4)6mn - 3m + 2n - 1 = 3m \times (2n - 1) + 1 \times (2n - 1)[/tex]