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17. 8 / 2 + √5 x 2 - √5 / 2 - √5 = 8 (2-√5) / 4-5 = 8 (2-√5) / -1 = -8 (2-√5) => a
18. ∛64 p ²/³ q ⁴/³ = 4 p ²/³ q ⁴/³ => d
19. 1 r¹ = r => b
20. 13²/⁴ x 14¹°/¹⁵ / 13³/6 x 14⁴/¹⁵ = 13²/⁴ ⁻ ³/⁶ x 14²/³ ⁻ ⁴/¹⁵
= 13 ¹/² - ¹/² x 14 ¹° ⁻ ⁴/¹⁵
= 13° x 14⁶/¹⁵
= 1 x 14 ⁶/¹⁵
= 14 ²/⁵ => d