Obliczenia
[tex](\sqrt2+3)(\sqrt2-1)=(\sqrt2)^2-\sqrt2+3\sqrt2-3=2+2\sqrt2-3=\boxed{2\sqrt2-1}\\\\(\sqrt5-\sqrt3)(\sqrt5+\sqrt3)=(\sqrt5)^2+\sqrt{15}-\sqrt{15}-(\sqrt3)^2=5-3=\boxed2[/tex]
