$$\left. \begin{array} { l } { 0.3 } \\ { 18.17 \times 19 = 9 } \\ { 10 \times 4 = 2 ; } \\ { x 1 y = 4 } \\ { 2.2 \frac { 2 } { 5 } } \end{array} \right.$$
