Question

сократите mn-3n+3-m/m^2-9

Answer 1

$frac{mn-3n+3-m}{m^{2}-9 } = frac{mn-m+3-3n}{m^{2}-9 } = frac{m(n-1)-3(n-1)}{(m-3)(m+3)}= frac{n-1}{m+3}$