Часть 2 страница 32, ГДЗ по математике за 2 класс к рабочей тетради Моро
Периметр прямоугольника
\[\begin{aligned} 40 + a + 5 &= \textcolor{#e03131}{\boldsymbol{40 + 17 + 5}} \mathrel{\textcolor{#e03131}{\boldsymbol{=}}} \textcolor{#e03131}{\boldsymbol{62}} \\ a - 10 + 8 &= \textcolor{#e03131}{\boldsymbol{17 - 10 + 8}} \mathrel{\textcolor{#e03131}{\boldsymbol{=}}} \textcolor{#e03131}{\boldsymbol{15}} \end{aligned}\]
\[\begin{array}{|c|c|c|c|c|c|c|c|} \hline \text{Уменьшаемое} & 58 & \textcolor{#e03131}{\mathbf{60}} & 70 & \textcolor{#e03131}{\mathbf{82}} & 94 & \textcolor{#e03131}{\mathbf{97}} & 85 \\ \hline \text{Вычитаемое} & \textcolor{#e03131}{\mathbf{48}} & 20 & \textcolor{#e03131}{\mathbf{40}} & 30 & \textcolor{#e03131}{\mathbf{34}} & 47 & \textcolor{#e03131}{\mathbf{55}} \\ \hline \text{Разность} & 10 & 40 & 30 & 52 & 60 & 50 & 30 \\ \hline \end{array}\]
\[\begin{aligned} 8 + 8 &= \textcolor{#e03131}{\boldsymbol{8 \cdot 2}} \mathrel{\textcolor{#e03131}{\boldsymbol{=}}} \textcolor{#e03131}{\boldsymbol{16}} \\ 10 + 10 + 10 &= \textcolor{#e03131}{\boldsymbol{10 \cdot 3}} \mathrel{\textcolor{#e03131}{\boldsymbol{=}}} \textcolor{#e03131}{\boldsymbol{30}} \\ 6 + 6 + 6 + 6 &= \textcolor{#e03131}{\boldsymbol{6 \cdot 4}} \mathrel{\textcolor{#e03131}{\boldsymbol{=}}} \textcolor{#e03131}{\boldsymbol{24}} \\ 1 + 1 + 1 + 1 &= \textcolor{#e03131}{\boldsymbol{1 \cdot 4}} \mathrel{\textcolor{#e03131}{\boldsymbol{=}}} \textcolor{#e03131}{\boldsymbol{4}} \\ 0 + 0 + 0 + 0 + 0 &= \textcolor{#e03131}{\boldsymbol{0 \cdot 5}} \mathrel{\textcolor{#e03131}{\boldsymbol{=}}} \textcolor{#e03131}{\boldsymbol{0}} \\ 15 + 15 + 15 &= \textcolor{#e03131}{\boldsymbol{15 \cdot 3}} \mathrel{\textcolor{#e03131}{\boldsymbol{=}}} \textcolor{#e03131}{\boldsymbol{45}} \end{aligned}\]
На одно пальто пришивают 5 пуговиц. Сколько нужно пуговиц для четырёх таких же пальто?
\(5 \cdot 4 = \textcolor{#e03131}{\mathbf{20}}\text{ (п.)}\)
Ответ: \(\textcolor{#e03131}{\mathbf{20}}\) пуговиц.
