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3√3 = 3√3 ×3√3=9×3= 27
b) 2-4√3 / 1+√3 = (2-4√3)×(1-√3) / (1+√3)×(1-√3) = 3-2√3-4√3+12 / 1-√3+√3-3 = 15-6√3 / -2
(×-mnożenie, / -dzielenie)
:)