Ответ:

[tex]1)75kl {}^{4} - 3 { k }^{2} l = 3kl(25 {l}^{3} - k)[/tex]

[tex]2)64 {x}^{2} - 16xy + {y}^{2} = (8x - y {)}^{2} [/tex]

[tex]3) \frac{25}{49 } {m}^{4} - {n}^{2} = ( \frac{5}{7} {m}^{2} - n)( \frac{5}{7} {m}^{2} + n)[/tex]