Question

очень сильно нужно прямо сейчас​

Answer 1

a)

$\frac{4 {m}^{2} - 9 {n}^{2} }{ {m}^{2} {n}^{2} } \times \frac{2mn}{2am + 3an} = \frac{(2m - 3n)(2m + 3n)}{mn} \times \frac{2}{a(2m - 3n)} = \frac{2m + 3n}{mn} \times \frac{2}{a} = \frac{4m + 6n}{amn}$

б)

$\frac{ {a}^{2} - 2ab }{a} + \frac{ {b}^{2} }{a} = \frac{ {a}^{2} - 2ab + {b}^{2} }{a} = \frac{(a - b)^{2} }{a}$