Question

Сократите дробь:
А) 15-5y/9-y^2
Б) m^2-4mn+4n^2/m^2-4n^2

Answer 1

$frac{15-5y}{9-y^2}= frac{5(3-y)}{(3-y)(3+y)}=frac{5}{3+y} \ frac{m^2-4mn+4n^2}{m^2-4n^2}= frac{(m-2n)^2}{(m-2n)(m+2n)}= frac{m-2n}{m+2n}$