Question

Сократить дробь a^2-25/ab-5b-3a+15

Answer 1

$\frac{ a^{2}-25 }{ab-5b-3a+15}= \frac{(a-5)*(a+5)}{b*(a-5)-3*(a-5)}= \frac{(a-5)*(a+5)}{(a-5)*(b-3)}= \frac{a+5}{b-3}$