\[\boxed{\text{1169\ (1169).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ {1,66}^{2} + 1,66 \cdot 4,68 + {2,34}^{2} =\]
\[= {1,66}^{2} + 2 \cdot 1,66 \cdot 2,34 + {2,34}^{2} =\]
\[= (1,66 + 2,34)^{2} = 4^{2} = 16\]
\[2)\ {1,04}^{2} - 1,04 \cdot 1,28 + {0,64}^{2} =\]
\[= {1,04}^{2} - 1,04 \cdot 0,64 \cdot 2 + {0,64}^{2} =\]
\[= (1,04 - 0,64)^{2} = {0,4}^{2} = 0,16.\ \]
\[\boxed{\text{1169.\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ 0x + 4y = 20\]
\[4y = 20\]
\[y = 5 \Longrightarrow \ \ (x;5);\ \ где\ x -\]
\[любое\ число.\]
\[2) - 3x + 0y = 27\]
\[- 3x = 27\]
\[x = - 9 \Longrightarrow \ ( - 9;y);\ \ где\ y -\]
\[любое\ число.\]