Question

Сократите дроби:

1)15а(а-в)\20в(а-в)

2)(3с-9d)^2\с+3d

Answer 1

$1) \: \: \frac{15a(a - b)}{20b(a - b)} = \frac{15a}{20b} = \frac{3a}{4b}$
$2) \: \: \frac{ {(3c - 9d)}^{2} }{c + 3d} = \frac{ {(3(c - 3d))}^{2} }{c + 3d} = \frac{9(c - 3d)^{2} }{c + 3d}$

Answer 2

Решение внизу на фото