\[\boxed{\text{1\ (1)\ .}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{з)}\ 16,94\ :2,8 =\]
\[= (16,94 \cdot 100)\ :(2,8 \cdot 100) =\]
\[= 1694\ :280 = 6,05\]
\[\textbf{и)}\ 75\ :1,25 =\]
\[= (75 \cdot 100)\ :(1,25 \cdot 100) =\]
\[= 7500\ :125 = 60\]