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√2 / √7 = √2*√7 / √7*√7 = √14 / 7
b) licznik i mianownik mnożę przez 3+2√2
√2 / (3-2√2) = √2*(3+2√2) / (3-2√2)*(3+2√2) = 3√2+2 / 9-8 = 2 + 3√2