Страница 51, ГДЗ по математике за 4 класс к тренажёру Конновой

\[\overset{\textcolor{#808080}{\scriptstyle 172\text{ см}}}{17\text{ дм }2\text{ см}} \cdot 5 = \boxed{\smash[b]{\underset{\hspace{7em}}{\textcolor{#e03131}{\mathbf{86}}\text{ дм}}}}\] \[\begin{array}{cr} & \vphantom{\overset{\bullet}{0}}172 \\ \smash{\raisebox{0.62em}{$\times$}} & 5 \\ \hline & \textcolor{#e03131}{\mathbf{8}\kern-0.075em\mathbf{6}\kern-0.075em\mathbf{0}\kern-0.075em} \end{array}\] \[\overset{\textcolor{#808080}{\scriptstyle 80\text{ мин}}}{1\text{ ч }20\text{ мин}} \overset{\kern0.25em\textcolor{#808080}{\scriptstyle 135\text{ мин}}\kern0.25em}{+} 55\text{ мин} = \boxed{\smash[b]{\underset{\hspace{7em}}{\textcolor{#e03131}{\mathbf{2}}\text{ ч }\textcolor{#e03131}{\mathbf{15}}\text{ мин}}}}\] \[\overset{\textcolor{#808080}{\scriptstyle 230\text{ с}}}{3\text{ мин }50\text{ с}} \overset{\kern0.25em\textcolor{#808080}{\scriptstyle 90\text{ с}}\kern0.25em}{-} \overset{\textcolor{#808080}{\scriptstyle 140\text{ с}}}{2\text{ мин }20\text{ с}} = \boxed{\smash[b]{\underset{\hspace{7em}}{\textcolor{#e03131}{\mathbf{1}}\text{ мин }\textcolor{#e03131}{\mathbf{30}}\text{ с}}}}\] \[\overset{\textcolor{#808080}{\scriptstyle 72\text{ мм}}}{7\text{ см }2\text{ мм}} : 9 = \boxed{\smash[b]{\underset{\hspace{7em}}{\textcolor{#e03131}{\mathbf{8}}\text{ мм}}}}\] \[\overset{\textcolor{#808080}{\scriptstyle 407\text{ см}^2}}{4\text{ дм}^2\text{ }7\text{ см}^2} \overset{\kern0.25em\textcolor{#808080}{\scriptstyle 447\text{ см}^2}\kern0.25em\rule[-0.35em]{0pt}{0.35em}}{+} 40\text{ см}^2 = \boxed{\smash[b]{\underset{\hspace{7em}}{\textcolor{#e03131}{\mathbf{4}}\text{ дм}^2\text{ }\textcolor{#e03131}{\mathbf{47}}\text{ см}^2}}}\] \[\overset{\textcolor{#808080}{\scriptstyle 70\text{ мм}}}{7\text{ см}} - \overset{\textcolor{#808080}{\scriptstyle 69\text{ мм}}}{6\text{ см }9\text{ мм}} = \boxed{\smash[b]{\underset{\hspace{7em}}{\textcolor{#e03131}{\mathbf{1}}\text{ мм}}}}\] \[\overset{\textcolor{#808080}{\scriptstyle 7\,260\,915\text{ г}}}{6\text{ т }9\text{ ц }360\text{ кг }915\text{ г}} : 3 = \boxed{\smash[b]{\underset{\hspace{13em}}{\textcolor{#e03131}{\mathbf{2}}\text{ т }\textcolor{#e03131}{\mathbf{4}}\text{ ц }\textcolor{#e03131}{\mathbf{20}}\text{ кг }\textcolor{#e03131}{\mathbf{305}}\text{ г}}}}\] \[\begin{array}{l|l} \mathllap{\smash{\raisebox{-0.5em}{$-$}}\,}\overset{\mathclap{\textcolor{#1c7ed6}{\frown}}}{7}260915 & \underline{\,3\phantom{000000}\,} \\ \underline{6}\phantom{000000} & \overset{\textcolor{#1c7ed6}{\bullet}}{\textcolor{#e03131}{\mathbf{2}\kern-0.075em}}\overset{\textcolor{#1c7ed6}{\bullet}}{\textcolor{#e03131}{\mathbf{4}\kern-0.075em}}\overset{\textcolor{#1c7ed6}{\bullet}}{\textcolor{#e03131}{\mathbf{2}\kern-0.075em}}\overset{\textcolor{#1c7ed6}{\bullet}}{\textcolor{#e03131}{\mathbf{0}\kern-0.075em}}\overset{\textcolor{#1c7ed6}{\bullet}}{\textcolor{#e03131}{\mathbf{3}\kern-0.075em}}\overset{\textcolor{#1c7ed6}{\bullet}}{\textcolor{#e03131}{\mathbf{0}\kern-0.075em}}\overset{\textcolor{#1c7ed6}{\bullet}}{\textcolor{#e03131}{\mathbf{5}\kern-0.075em}} \\ \mathllap{\smash{\raisebox{-0.5em}{$-$}}\,}12\phantom{00000} & \\ \underline{12}\phantom{00000} & \\ \phantom{00}\mathllap{\smash{\raisebox{-0.5em}{$-$}}\,}6\phantom{0000} & \\ \phantom{00}\underline{6}\phantom{0000} & \\ \phantom{0000}\mathllap{\smash{\raisebox{-0.5em}{$-$}}\,}9\phantom{00} & \\ \phantom{0000}\underline{9}\phantom{00} & \\ \phantom{00000}\mathllap{\smash{\raisebox{-0.5em}{$-$}}\,}15 & \\ \phantom{00000}\underline{15} & \\ \phantom{000000}0 & \end{array}\] \(\textcolor{#808080}{{360\text{ кг} = 3\text{ ц }60\text{ кг}}\text{,}}\) \(\textcolor{#808080}{\text{поэтому }{6\text{ т }9\text{ ц }360\text{ кг }915\text{ г} = 7\text{ т }2\text{ ц }60\text{ кг }915\text{ г}}\text{.}}\)