\[Страница\ 65.\]
\[\boxed{\mathbf{42.}}\]
\[2 \cdot 2 + 4 \cdot 2 = 4 + 8 =\]
\[= 12\ (см) - периметр\ \]
\[прямоугольника.\]
\[\boxed{\mathbf{43.}}\]
\[Запишите\ только\ ответы\]
\[(слева\ направо):\]
\[20;\ \ 35;\ \ 40;\ \ 15;\ \ 45;\ \ 30;\ \ 10.\]
\[\boxed{\mathbf{44.}}\]
\[1)\ 6 \cdot x = 24\]
\[x = 4.\]
\[35\ :x = 7\]
\[x = 5.\]
\[y\ :4 = 7\]
\[y = 28.\]
\[2)\ 14 + x = 34\]
\[x = 34 - 14\]
\[x = 20.\]
\[\overline{14 + 20 = 34}\]
\[34 = 34.\]
\[75 - x = 8\]
\[x = 75 - 8\]
\[x = 67.\]
\[\overline{75 - 67 = 8}\]
\[8 = 8.\]
\[y - 20 = 47\]
\[y = 47 + 20\]
\[y = 67.\]
\[\overline{67 - 20 = 47}\]
\[47 = 47.\]