{(mn - n²)/(m + n)} ÷ {(n - m)/m} = কত?

প্রশ্ন: {(mn - n²)/(m + n)} ÷ {(n - m)/m} = কত?

সমাধান:
(mn - n²)/(m + n) ÷ (n - m)/m
= n(m - n)/(m + n) × m/(n - m)
= - n(n - m)/(m + n) × m/(n - m)
= - n/(m + n) × m
= - mn/(m + n)