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(√125 - 2√75)/√5 = (√(25 * 5) - 2√(25 * 3) = (5√5 - 10√3)/√5 = 5(√5 - 2√3)/√5 =
= 5√5(√5 - 2√3)/5 = √5(√5 - √3)
b)
100 * (5/2)² - 64²/³ - 2² = 100 * 25/4 - ∛64² - 4 = 25 * 25 - 16 - 4 = 625 - 20 = 605