Question

сократите дробь пжл)))

Answer 1

$frac{m^2-n^2-km+kn}{k^2-km-mn-n^2}= frac{(m^2-n^2)-(km-kn)}{(k^2-n^2)-(km+mn)}= frac{(m-n)(m+n)-k(m-n)}{(k-n)(k+n)-m(k+n)}=\\= frac{(m-n)(m+n-k)}{(k+n)(k-n-m)}= frac{(m-n)(m+n-k)}{-(k+n)(m+n-k)}= frac{n-m}{k+n}$