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√15 * √5/√3 = √(75/3) = √25 = 5
2.
√27/9 * 3³ - (1/3)² = 3√3/9 * 27 - (1/3)² = √3/9 * 9 - (1/9) = √3/81 - 1/9 =
= (9√3 - 81)/81 = 9(√3 - 9)/81 = (√3 - 9)/9
3
- 3√10/2√5 = - 3√10 * √5/2√5 * √5 = - 3√50/2 * 5 = - 3√(25 * 2)/10 = - 3 * 5√2/10 =
= - 15√2/10 = - 3√2/2
4.
(∛n)⁶ = ∛n⁶ = ∛n³ * ∛n³ = n * n = n²