1. m/n²-1/m=(m²-n²)/(mn²)=(m-n)(m+n)/(mn²).
2. (1/n+1/m)=(m+n)/(mn).
3. ((m-n)(m+n)/(mn²)):((m+n)/(mn))=(m-n)(m+n)(mn)/((mn²)(m+n))=(m-n)/n.
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Answers & Comments
1. m/n²-1/m=(m²-n²)/(mn²)=(m-n)(m+n)/(mn²).
2. (1/n+1/m)=(m+n)/(mn).
3. ((m-n)(m+n)/(mn²)):((m+n)/(mn))=(m-n)(m+n)(mn)/((mn²)(m+n))=(m-n)/n.