Сократите дробь: 1)р^2-25g^2\2р-10g 2)7в-14в^2\42в^2-21в 3)(3х+6у)^2\5х+10у \-Это дробь.

Решите задачу:

$1) \: \: \frac{ {p}^{2} - 25 {g}^{2} }{2p - 10g} = \frac{(p - 5g)(p + 5g)}{2(p - 5g)} = \frac{p + 5g}{2}$
$2) \: \: \frac{7b - 14 {b}^{2} }{42 {b}^{2} - 21b} = \frac{7b(1 - 2b)}{21b(2b - 1)} = \frac{ - 7b(2b - 1)}{21b(2b - 1)} = - \frac{1}{3}$
$3) \: \: \frac{ {(3x + 6y)}^{2} }{5x + 10y} = \frac{ {(3(x + 2y))}^{2} }{5(x + 2y)} = \frac{9(x + 2y)}{5}$