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4.a. 216^⅔ = ^3√(216)²
= (6)²
= 36 √
4.b. 81^-¾ = ^4√(81)^-3
= (3)^-3
= 1/3³
= 1/27 √
4c. 5^⅔ × 25^⅔ × 8^⅔
= 5^⅔ × (5²)^⅔ × 8^⅔
= 5^(⅔ + 4/3) × 2²
= 5² × 2²
= 25 × 4
= 100 √
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