Часть 2 страница 32, ГДЗ по математике за 4 класс к рабочей тетради Дорофеева

\(200 : 40 = \textcolor{#e03131}{\mathbf{5}}\text{ (ч)}\)
Ответ: \(\textcolor{#e03131}{\mathbf{5}}\) ч.

1) В школьной библиотеке всего было 936 книг. Из них \({\frac{2}{3}}\) составляли рассказы и повести, а остальное — сказки. Сколько сказок было в библиотеке? \[\begin{matrix} \hspace{1.04em}\mathclap{1)}\hspace{1.04em}\enspace \underbrace{\overbrace{\vphantom{\bullet}\rule[0.2em]{3.833em}{0.1em}}^{\mathclap{\text{Расск. и пов.}}}\overset{\mathclap{\text{Сказки — ?}}}{\vphantom{\bullet}\textcolor{#ff8787}{\rule[0.2em]{3.833em}{0.1em}}\textcolor{#ff8787}{\rule[0.2em]{3.833em}{0.1em}}}\mathllap{\mathclap{\bullet}\hspace{3.833em}\mathclap{\bullet}\hspace{3.833em}\mathclap{\bullet}\hspace{3.833em}\mathclap{\bullet}}}_{936} \\[14pt] \hspace{1.04em}\mathclap{\vcenter{\textcolor{#e03131}{\huge\bigcirc}}}\mathclap{2)}\hspace{1.04em}\enspace \underbrace{\overbrace{\vphantom{\bullet}\rule[0.2em]{3.833em}{0.1em}\rule[0.2em]{3.833em}{0.1em}}^{\mathclap{\text{Расск. и пов.}}}\overset{\mathclap{\text{Сказки — ?}}}{\vphantom{\bullet}\textcolor{#ff8787}{\rule[0.2em]{3.833em}{0.1em}}}\mathllap{\mathclap{\bullet}\hspace{3.833em}\mathclap{\bullet}\hspace{3.833em}\mathclap{\bullet}\hspace{3.833em}\mathclap{\bullet}}}_{936} \\[14pt] \hspace{1.04em}\mathclap{3)}\hspace{1.04em}\enspace \underbrace{\overbrace{\vphantom{\bullet}\rule[0.2em]{2.875em}{0.1em}\rule[0.2em]{2.875em}{0.1em}}^{\mathclap{\text{Расск. и пов.}}}\overset{\mathclap{\text{Сказки — ?}}}{\vphantom{\bullet}\textcolor{#ff8787}{\rule[0.2em]{2.875em}{0.1em}}\textcolor{#ff8787}{\rule[0.2em]{2.875em}{0.1em}}}\mathllap{\mathclap{\bullet}\hspace{2.875em}\mathclap{\bullet}\hspace{2.875em}\mathclap{\bullet}\hspace{2.875em}\mathclap{\bullet}\hspace{2.875em}\mathclap{\bullet}}}_{936} \\[14pt] \hspace{1.04em}\mathclap{4)}\hspace{1.04em}\enspace \underbrace{\overbrace{\vphantom{\bullet}\rule[0.2em]{1.917em}{0.1em}\rule[0.2em]{1.917em}{0.1em}}^{\mathclap{\text{Расск. и пов.}}}\overset{\mathclap{\text{Сказки — ?}}}{\vphantom{\bullet}\textcolor{#ff8787}{\rule[0.2em]{1.917em}{0.1em}}\textcolor{#ff8787}{\rule[0.2em]{1.917em}{0.1em}}\textcolor{#ff8787}{\rule[0.2em]{1.917em}{0.1em}}\textcolor{#ff8787}{\rule[0.2em]{1.917em}{0.1em}}}\mathllap{\mathclap{\bullet}\hspace{1.917em}\mathclap{\bullet}\hspace{1.917em}\mathclap{\bullet}\hspace{1.917em}\mathclap{\bullet}\hspace{1.917em}\mathclap{\bullet}\hspace{1.917em}\mathclap{\bullet}\hspace{1.917em}\mathclap{\bullet}}}_{936} \end{matrix}\] \(936 - 936 : 3 \cdot 2 = \textcolor{#e03131}{\mathbf{312}}\text{ (к.)}\)
Ответ: \(\textcolor{#e03131}{\mathbf{312}}\) сказок.
2) У Серёжи в коллекции всего 120 марок. Из них \({\frac{1}{8}}\) составляют марки с животными, \({\frac{3}{8}}\) — марки с растениями, а остальные — марки с путешественниками. Сколько марок с путешественниками в коллекции у Серёжи? \[\begin{matrix} \hspace{1.04em}\mathclap{\vcenter{\textcolor{#e03131}{\huge\bigcirc}}}\mathclap{1)}\hspace{1.04em}\enspace \underbrace{\overbrace{\vphantom{\bullet}\rule[0.2em]{1.438em}{0.1em}}^{\mathclap{\text{Жив.}}}\overbrace{\vphantom{\bullet}\rule[0.2em]{1.438em}{0.1em}\rule[0.2em]{1.438em}{0.1em}\rule[0.2em]{1.438em}{0.1em}}^{\mathclap{\text{Раст.}}}\overset{\mathclap{\text{Пут. — ?}}}{\vphantom{\bullet}\textcolor{#ff8787}{\rule[0.2em]{1.438em}{0.1em}}\textcolor{#ff8787}{\rule[0.2em]{1.438em}{0.1em}}\textcolor{#ff8787}{\rule[0.2em]{1.438em}{0.1em}}\textcolor{#ff8787}{\rule[0.2em]{1.438em}{0.1em}}}\mathllap{\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}}}_{120} \\[14pt] \hspace{1.04em}\mathclap{2)}\hspace{1.04em}\enspace \underbrace{\overbrace{\vphantom{\bullet}\rule[0.2em]{1.438em}{0.1em}\rule[0.2em]{1.438em}{0.1em}\rule[0.2em]{1.438em}{0.1em}}^{\mathclap{\text{Жив.}}}\overbrace{\vphantom{\bullet}\rule[0.2em]{1.438em}{0.1em}\rule[0.2em]{1.438em}{0.1em}}^{\mathclap{\text{Раст.}}}\overset{\mathclap{\text{Пут. — ?}}}{\vphantom{\bullet}\textcolor{#ff8787}{\rule[0.2em]{1.438em}{0.1em}}\textcolor{#ff8787}{\rule[0.2em]{1.438em}{0.1em}}\textcolor{#ff8787}{\rule[0.2em]{1.438em}{0.1em}}}\mathllap{\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}}}_{120} \\[14pt] \hspace{1.04em}\mathclap{3)}\hspace{1.04em}\enspace \underbrace{\overbrace{\vphantom{\bullet}\rule[0.2em]{1.438em}{0.1em}}^{\mathclap{\text{Жив.}}}\overbrace{\vphantom{\bullet}\rule[0.2em]{1.438em}{0.1em}\rule[0.2em]{1.438em}{0.1em}\rule[0.2em]{1.438em}{0.1em}\rule[0.2em]{1.438em}{0.1em}}^{\mathclap{\text{Раст.}}}\overset{\mathclap{\text{Пут. — ?}}}{\vphantom{\bullet}\textcolor{#ff8787}{\rule[0.2em]{1.438em}{0.1em}}\textcolor{#ff8787}{\rule[0.2em]{1.438em}{0.1em}}\textcolor{#ff8787}{\rule[0.2em]{1.438em}{0.1em}}}\mathllap{\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}}}_{120} \\[14pt] \hspace{1.04em}\mathclap{4)}\hspace{1.04em}\enspace \underbrace{\overbrace{\vphantom{\bullet}\rule[0.2em]{1.438em}{0.1em}}^{\mathclap{\text{Жив.}}}\overbrace{\vphantom{\bullet}\rule[0.2em]{1.438em}{0.1em}\rule[0.2em]{1.438em}{0.1em}}^{\mathclap{\text{Раст.}}}\overset{\mathclap{\text{Пут. — ?}}}{\vphantom{\bullet}\textcolor{#ff8787}{\rule[0.2em]{1.438em}{0.1em}}\textcolor{#ff8787}{\rule[0.2em]{1.438em}{0.1em}}\textcolor{#ff8787}{\rule[0.2em]{1.438em}{0.1em}}\textcolor{#ff8787}{\rule[0.2em]{1.438em}{0.1em}}\textcolor{#ff8787}{\rule[0.2em]{1.438em}{0.1em}}}\mathllap{\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}\hspace{1.438em}\mathclap{\bullet}}}_{120} \end{matrix}\] \(120 - 120 : 8 - 120 : 8 \cdot 3 = \textcolor{#e03131}{\mathbf{60}}\text{ (мар.)}\)
Ответ: \(\textcolor{#e03131}{\mathbf{60}}\) марок.