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\frac{yy}{yx^{2}}+\frac{xx^{2}}{yx^{2}}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of x^{2} and y is yx^{2}. Multiply \frac{y}{x^{2}} times \frac{y}{y}. Multiply \frac{x}{y} times \frac{x^{2}}{x^{2}}.
\frac{yy+xx^{2}}{yx^{2}}
Since \frac{yy}{yx^{2}} and \frac{xx^{2}}{yx^{2}} have the same denominator, add them by adding their numerators.
\frac{y^{2}+x^{3}}{yx^{2}}
Do the multiplications in yy+xx^{2}.