Question

сократите дробь$frac{ab-2b-6+3a}{a ^{2}-4 }$

Answer 1

$frac{ab-2b-6+3a}{a^2-4} = frac{b(a-2)+3(a-2)}{(a-2)(a+2)} = frac{(b+3)(a-2)}{(a-2)(a+2)} = frac{b+3}{a+2}$