Evaluate: (8⁻¹ − 9⁻¹)⁻¹ ÷ (4⁻¹ − 9⁻¹)⁻¹ =

Evaluate: [(2.1)³ + (5.8)³] / [(2.1)² - 2.1 × 5.8 + (5.8)²] =

Evaluate: [(6.73)³ - (4.38)³] / [(6.73)² + 6.73 × 4.38 + (4.38)²] =

Evaluate: √(12.0409) - √(1.2544) =

Evaluate the square root expression: √(9 + 4√5) =

Evaluate: (0.0203 × 2.92) / (0.0073 × 14.5 × 0.7).