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1. $\frac{x + y}{x} + \frac{x - y}{y} - \frac{x^{2} - y^{2}}{x y} = ?$

Answer: Option D

Explanation:

\frac{x + y}{x} + \frac{x - y}{y} - \frac{x^{2} - y^{2}}{x y} = \frac{x y + y^{2} + x^{2} - x y - x^{2} + y}{x y} = \frac{2 y^{2}}{x y} = \frac{2 y}{x}

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