Cześć!
Obliczenia
[tex]9\sqrt4-4\sqrt9=9\sqrt{2^2}-4\sqrt{3^2}=9\cdot2-4\cdot3=18-12=\boxed6\\\\9\sqrt{\frac{1}{4}}\cdot4\sqrt{\frac{1}{9}}=9\cdot4\cdot\sqrt{\frac{1}{4}\cdot\frac{1}{9}}=36\cdot\sqrt{\frac{1}{36}}=36\cdot\sqrt{(\frac{1}{6})^2}=36\cdot\frac{1}{6}=\boxed6[/tex]
