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= 3³⁻¹/3⁵⁺² = 3⁴/3⁷ = 3⁴⁻⁷ = 3⁻³
b. 5²×(1/123)⁻¹/25² = 5²×123/(5²)² = 5²×123/5⁴ = 5²⁻⁴×123 = 5⁻²×123
c. (4²×2⁻⁴)×(5²×3⁻²)² = ((2²)²×2⁻⁴)×(5²*²×3⁻²*²) = (2⁴×2⁻⁴)×(5⁴×3⁻⁴) = (5⁴×3⁻⁴)