\[\boxed{\text{1\ (1).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ 0,72 + 3,018 = 3,738\]
\[2)\ 4 - 2,8 = 1,2\]
\[3)\ 1,8 \cdot 0,3 = 0,54\]
\[4)\ 5,4\ :6 = 54\ \ :60 = \frac{54}{60} =\]
\[= \frac{9}{10} = 0,9\]
\[5)\ 72\ :0,09 = 7200\ :9 = 800\]
\[6)\ 9\ :4 = 2,25\]