(mn-m²)÷(m²-2mn+n²)/mn·(m²-n²)/m²
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(mn-m²)÷(m²-2mn+n²)/mn·(m²-n²)/m²(mn-m²)÷(m²-2mn+n²)/mn
(mn-m²)÷(m²-2mn+n²)/mn·(m²-n²)/m²
(mn-m²)÷(m²-2mn+n²)/mn·(m²-n²)/m²
(mn-m²)÷(m²-2mn+n²)/mn·(m²-n²)/m²
(mn-m²)÷(m²-2mn+n²)/mn·(m²-n²)/m²
=m(n-m) · (mn)/(m-n)² · (m+n)(m-n)/m²
=-n(m+n)