Question

сократить дробь a^2-25/ab-5b-3a+15

Answer 1

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