\[\boxed{\mathbf{659\ (659)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ x = 5:\]
\[y = 0,2 \cdot 5 = 1.\]
\[2)\ x = 1,2:\]
\[y = 0,2 \cdot 1,2 = 0,24.\]
\[y = 4:\]
\[4 = 0,2x\]
\[x = 4\ :0,2 = 40\ :2\]
\[x = 20.\]