$$\left. \begin{array} { l } { - 444 } \\ { 280 \times 80 \times 5564 } \\ { = 280 \times 65 \times 535 ( 05 \times 10 ^ { \circ } ) } \\ { = 2000 \times 60 \times 6 \times 6 \times 10 ^ { - 3 } + 5 \times 30 ^ { - 6 } } \end{array} \right.$$
