Obliczenia :
[tex]a] \ \frac{7}{\sqrt{11}}\cdot\frac{\sqrt{11}}{\sqrt{11}}=\frac{7\sqrt{11}}{\sqrt{11^2}}=\frac{7\sqrt{11}}{11}\\\\b] \ \frac{4}{2\sqrt3}\cdot\frac{\sqrt3}{\sqrt3}=\frac{4\sqrt3}{2\sqrt{3^2}}=\frac{4\sqrt3}{2\cdot3}=\frac{4\sqrt3}{6}=\frac{2\sqrt3}{3}[/tex]
