\(\dfrac{5xy^2-2z}{3xy}+\dfrac{5y^2x+2z}{3xy}=\dfrac{5xy^2-2z+5y^2x+2z}{3xy}\)
\(=\dfrac{5x^2y+5y^2x}{3xy}=\dfrac{5xy\left(x+y\right)}{3xy}=\dfrac{5\left(x+y\right)}{3}\)
d.
\(\dfrac{5}{6x^2y}+\dfrac{7}{12xy^2}+\dfrac{11}{18xy}=\dfrac{30y}{36x^2y^2}+\dfrac{21x}{36x^2y^2}+\dfrac{22xy}{36x^2y^2}\)
\(=\dfrac{22xy+21x+30y}{36x^2y^2}\)
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