Answer:
Step-by-step explanation:
[tex]\dfrac{3m^{-1}y^{2}}{m^{-2}}-\dfrac{5m^{2}y^{2}}{x^{2}}+\dfrac{my^{2}}{m^{-1}x^{2}}\\\\=3m^{-1-[-2]}y^{2} - \dfrac{5m^{2}y^{2}}{x^{2}}+\dfrac{m^{1-[-1]}y^{2}}{x^{2}}\\\\=3m^{-1+2}y^{2}-\dfrac{5m^{2}y^{2}}{x^{2}}+\dfrac{m^{1+1}y^{2}}{x^{2}}\\\\=3my^{2}-\dfrac{5m^{2}y^{2}}{x^{2}}+\dfrac{m^{2}y^{2}}{x^{2}}\\\\=3my^{2}-\dfrac{4m^{2}y^{2}}{x^{2}}[/tex]
