m/(m-n)^2-n/(n-m)^2

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m/(m-n)^2-n/(n-m)^2m/(m-n)^2-n/(n-m)^2m/(m-n)^2-n/(n-m)^2m/(m-n)^2-n/(n-m)^2=m/(m-n)^2-n/(m-n)^2=(m-

m/(m-n)^2-n/(n-m)^2
m/(m-n)^2-n/(n-m)^2

m/(m-n)^2-n/(n-m)^2
m/(m-n)^2-n/(n-m)^2
=m/(m-n)^2-n/(m-n)^2
=(m-n)/(m-n)^2
=1/(m-n)

=m/(m-n)² -n/(m-n)²
=(m-n)/(m-n)²
=1/(m-n)