Question

ОЧЕНЬЬ СРОЧНО ПОМОГИТЕ!!!!!
заранее огромное спасибо!!!

Answer 1

1)

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

$а = 4, \: b = - 2$

$\frac{a - b}{a + b} = \frac{4 - ( - 2)}{4 + ( - 2)} = \frac{4 + 2}{4 - 2} = \frac{6}{2} = 3$

2)

$\frac{ {c}^{3} + dc }{ {c}^{2}d + {d}^{2} } = \frac{c( {c}^{2} + d)}{d( {c}^{2} + d)} = \frac{c}{d}$

$c = - 2, \: d = 10$

$\frac{c}{d} = \frac{ - 2}{10} = - \frac{1}{5}$