Часть 1 страница 79, ГДЗ по математике за 4 класс к рабочей тетради Дорофеева
Деление круглых чисел на круглые десятки
\[\begin{aligned} 9 &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{>}}}}\hspace{0.72em}} 160 \cdot 3 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 8}}\rule[-0.35em]{0pt}{0.35em}}{:} 60 & \qquad 870 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 29}}\rule[-0.35em]{0pt}{0.35em}}{:} 30 &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{<}}}}\hspace{0.72em}} 30 \\ 540 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 18}}\rule[-0.35em]{0pt}{0.35em}}{:} 30 &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{=}}}}\hspace{0.72em}} 18 & \qquad 600 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 30}}\rule[-0.35em]{0pt}{0.35em}}{:} 20 &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{=}}}}\hspace{0.72em}} 30 \\ 40 &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{>}}}}\hspace{0.72em}} 360 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 4}}\rule[-0.35em]{0pt}{0.35em}}{:} 90 \\ 280 \cdot 2 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 7}}\rule[-0.35em]{0pt}{0.35em}}{:} 80 &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{<}}}}\hspace{0.72em}} 70 \end{aligned}\]
\(720 : (320 : 8) = \textcolor{#e03131}{\mathbf{18}}\text{ (ч)}\)
Ответ: за \(\textcolor{#e03131}{\mathbf{18}}\) ч.
\[\begin{array}{rclrcl} \fcolorbox{#272727}{#ffc078}{$510 : 30$} & \textcolor{#e03131}{\rule[0.32em]{2.2em}{0.09em}} & \fcolorbox{#272727}{#ffc078}{$17$} & \quad \fcolorbox{#272727}{#f783ac}{$700 : 20$} & \textcolor{#e03131}{\rule[0.32em]{2.2em}{0.09em}} & \fcolorbox{#272727}{#f783ac}{$35$} \\[8pt] \fcolorbox{#272727}{#a5d8ff}{$936 : 8$} & \textcolor{#e03131}{\rule[0.32em]{2.2em}{0.09em}} & \fcolorbox{#272727}{#a5d8ff}{$117$} & \quad \fcolorbox{#272727}{#d0bfff}{$218 \cdot 2$} & \textcolor{#272727}{\rule[0.32em]{2.2em}{0.09em}} & \fcolorbox{#272727}{#d0bfff}{$436$} \\[8pt] \fcolorbox{#272727}{#8ce99a}{$316 : 4$} & \textcolor{#e03131}{\rule[0.32em]{2.2em}{0.09em}} & \fcolorbox{#272727}{#8ce99a}{$79$} & \quad \fcolorbox{#272727}{#d2a679}{$90 \cdot 5 : 6$} & \textcolor{#e03131}{\rule[0.32em]{2.2em}{0.09em}} & \fcolorbox{#272727}{#d2a679}{$75$} \\[8pt] \fcolorbox{#272727}{#ffe066}{$310 - 99$} & \textcolor{#e03131}{\rule[0.32em]{2.2em}{0.09em}} & \fcolorbox{#272727}{#ffe066}{$211$} & \quad \fcolorbox{#272727}{#ff8787}{$507 + 83$} & \textcolor{#e03131}{\rule[0.32em]{2.2em}{0.09em}} & \fcolorbox{#272727}{#ff8787}{$590$} \end{array}\] Раскрась розетку тем же цветом, что и цвет телефона.
\(1)\ 128 : 2 = \textcolor{#e03131}{\mathbf{64}}\text{ (м)}\)
\(2)\ 64 - 57 = \textcolor{#e03131}{\mathbf{7}}\text{ (м)}\)
\(3)\ S = 57 \cdot 7 = \textcolor{#e03131}{\mathbf{399}}\text{ (м}^2\text{)}\)
Ответ: \(\textcolor{#e03131}{\mathbf{399}}\) м².
