\[\ 6,216\ \ :5,1 = 1,21882 \approx 1,22\]
\[(4,14\ :8,44 + 16,04) \cdot 8,01 - (3,73)^{9} \approx\]
\[\approx - 139,\ 626\]
\[\ 6\sqrt{1\frac{7}{9}} - 4 = 6\sqrt{\frac{16}{9}} - 4 = 6 \cdot \frac{4}{3} - 4 =\]
\[= 8 - 4 = 4\]