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\frac{bb}{ab}+\frac{aa}{ab}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of a and b is ab. Multiply \frac{b}{a} times \frac{b}{b}. Multiply \frac{a}{b} times \frac{a}{a}.
\frac{bb+aa}{ab}
Since \frac{bb}{ab} and \frac{aa}{ab} have the same denominator, add them by adding their numerators.
\frac{b^{2}+a^{2}}{ab}
Do the multiplications in bb+aa.