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= (y/x) + (x/y)
= (x²+y²)/xy
2. (x⁻¹ - y³)/(x⁻⁵ + y⁻²)
= (1/x - 1/y³) / (1/x⁵ + 1/y²)
= ((y³ - x)/xy³)) / ((x⁵+y²)/x⁵y²)
= ((y³ - x)x⁴/y(x⁵+y²))
3. ((xy)⁻² + x⁻³y)/(x²y¹ - x⁻⁴y³)
= ((1/(xy)² + y/x³)) / (x²/y - y³/x⁴)
= ((x³ + (xy)²)/x⁵y²)) / ((x⁶ - y⁴)/x⁴y)
= ((x³ + (xy)²)y/x(x⁶ - y⁴))
4. (x⁻³ + y⁻²)/(x - y)⁻³
= (1/x³ + 1/y²)(x - y)³
= ((x³ + y²)(x - y)³)/x³y²