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6. (x²/y)³ = x²ˣ³ / y³ = x⁶ / y³7. ((2/3)²)⁴ = (2/3)²ˣ⁴ = (2/3)⁸ = 2⁸/3⁸ = 256/729
8. (-1/2)³ x (- 1/2)⁴ = (-1/2)³⁺⁴ = (-1/2)⁷ = - 1/2⁷ = - 1/128
9. (1/5)³ : (1/5)⁵ = (1/5)³⁻⁵ = (1/5)⁻² = (5⁻¹)⁻² = 5² = 25
10.; 2a²b²c² / 4ab⁵c³ = a²⁻¹b²⁻⁵c²⁻³ /2 = ab⁻³c⁻¹/2 = a/ (2b³c)
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