[tex]Zadanie\ 18\\\\a)\\\\(1\frac{3}{4})^{6}\cdot (\frac{2}{7})^{6}=(\frac{7}{4}\cdot \frac{2}{7})^{6}=(\frac{1}{2})^{6} =\frac{1}{64}\\\\b)\\\\(0,8)^{4}:(2\frac{2}{3})^{4}=(\frac{8}{10}:\frac{8}{3})^{4} =(\frac{8}{10}\cdot \frac{3}{8})^{4}=(\frac{3}{10})^{4}=\frac{81}{10000}= 0,0081[/tex]
