\[\boxed{\mathbf{Страница}\mathbf{\ \ 78}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\boxed{\mathbf{1}\mathbf{.}}\]
\[15\ :5 + 7 \cdot 7 = 3 + 49 = 52\]
\[100 - 45\ :5 - 18 =\]
\[= 100 - 9 - 18 = 91 - 18 = 73\]
\[56\ :7 + 8 \cdot 6 = 8 + 48 = 56\]
\[62 + 63\ :7 - 45 = 62 + 9 - 45 =\]
\[= 71 - 45 = 26\]
\[27\ :3 - 72\ :9 = 9 - 8 = 1\]
\[56 + 6 \cdot 2 - 39 = 56 + 12 - 39 =\]
\[= 68 - 39 = 29\]
\[\boxed{\mathbf{2}\mathbf{.}}\]
\[80 -^{4}\left( 26 +^{1}37 \right)\ :^{3}9 +^{5}\left( 74 -^{2}56 \right)\]
\[70 +^{4}\left( 55 -^{1}38 -^{2}9 \right) -^{5}48\ :^{3}6\]
\[\boxed{\mathbf{3}\mathbf{.}\mathbf{\ }}\]
\[Длина\] | \[3\ см\] | \[8\ см\] | \[10\ см\] | \[9\ см\] | \[6\ см\] |
---|---|---|---|---|---|
\[Ширина\] | \[4\ см\] | \[2\ см\] | \[6\ см\] | \[6\ см\] | \[7\ см\] |
\[Площадь\] | \[12\ см^{2}\] | \[16\ см^{2}\] | \[60\ см^{2}\] | \[54\ см^{2}\] | \[42\ см^{2}\] |
\[Периметр\] | \[14\ см\] | \[20\ см\] | \[32\ см\] | \[30\ см\] | \[26\ см\] |
\[\boxed{\mathbf{4}\mathbf{.}\mathbf{\ }}\]
\[x + 15 = 3 \cdot 8\]
\[x + 15 = 24\]
\[x = 24 - 15\]
\[x = 9\]
\[\overline{9 + 15 = 3 \cdot 8}\]
\[24 = 24.\]
\[y\ :6 = 9\]
\[y = 9 \cdot 6\]
\[y = 54\]
\[\overline{54\ :6 = 9}\]
\[9 = 9.\]
\[a \cdot 4 = 41 - 9\]
\[a \cdot 4 = 32\]
\[a = 32\ :4\]
\[a = 8\]
\[\overline{8 \cdot 4 = 41 - 9}\]
\[32 = 32.\]