Odpowiedź :
[tex]a) \sqrt{5} (3 - \sqrt{5} ) = 3 \sqrt{5} - 5 \\ b)2 \sqrt{2} (3 - \sqrt{8} ) = 6 \sqrt{2} - 2 \sqrt{16} = 6 \sqrt{2} - 2 \times 4 = 6 \sqrt{2} - 8 \\ c)(2 - \sqrt{2} )( \sqrt{2} - 1) = 2 \sqrt{2} - 2 - 2 + \sqrt{2} = 3 \sqrt{2} - 4[/tex]