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= (1/a)³
7. [(a/b)³]⁸ = (a/b) ⁽³ · ⁸⁾
= (a/b) ²⁴
8. (x³ y⁴ z²)¹² = x⁽³ ·¹²⁾ y⁽⁴·¹²⁾ z⁽²·¹²⁾
= x³⁶ y⁴⁸ z²⁴
9. (2⁻² × 2⁸) × 2⁻⁶ = 2⁽⁻²⁺⁸⁺⁻⁶⁾
= 2⁰
= 1