(2*\frac{5}{6})^2-(3^2-\sqrt{1\frac{7}{9}})=
źródło:
(2*\frac{5}{6})^2-(3^2-\sqrt{1\frac{7}{9}})=(\frac{5}{3})^2-(9-\sqrt{\frac{16}{9}})=
=\frac{25}{9}-(9-\frac{4}{3})=\frac{25}{9}-9+\frac{12}{9}=\frac{37}{9}-9=
=4\frac{1}{9}-9=-4\frac{8}{9}