\[\sqrt{7\frac{1}{9}} + \sqrt{3\frac{1}{16}} - 0,04\sqrt{90000} =\]
\[= \sqrt{\frac{64}{9}} + \sqrt{\frac{49}{16}} - 0,04 \cdot 300 =\]
\[= \frac{8^{\backslash 4}}{3} + \frac{7^{\backslash 3}}{4} - 12^{\backslash 12} =\]
\[= \frac{32 + 21 - 144}{12} = - \frac{91}{12} =\]
\[= - 7\frac{7}{12}\]