Oblicz:
[tex] \frac{1}{1 + \sqrt{3} } [/tex]
[tex] \frac{1}{3 - \sqrt{2} } [/tex]
[tex] \frac{3}{2 + \sqrt{5} } [/tex]
[tex](x - 1) ^{2} - (x + 2) {}^{2} = 6[/tex]
[tex](3 - x) {}^{2} + (2x - 1) {}^{2} = 5x {}^{2} [/tex]

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