Страница 21, ГДЗ за 5 класс к математическому тренажеру Жохова

Ж \[\begin{array}{lll} & 1) & 2) \\[14pt] \text{Длина} & 4\text{ м} & 15\text{ дм} \\[14pt] \text{Ширина} & 5\text{ дм} & 2\text{ дм} \\[14pt] \text{Периметр} & \underset{\textcolor{#808080}{(40\,+\,5)\,\cdot\,2}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{90}}\text{ дм}}}}} & \underset{\textcolor{#808080}{(15\,+\,2)\,\cdot\,2}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{34}}\text{ дм}}}}} \\[14pt] \text{Площадь} & \underset{\textcolor{#808080}{40\,\cdot\,5}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{200}}\text{ дм}^2}}}} & \underset{\textcolor{#808080}{15\,\cdot\,2}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{30}}\text{ дм}^2}}}} \end{array}\] \(\textcolor{#808080}{\text{1) }{4}\text{ м}}\) \(\textcolor{#808080}{{= 40}\text{ дм.}}\)

З \[\begin{array}{lll} & 1) & 2) \\[14pt] \text{Длина} & \underset{\textcolor{#808080}{70\,:\,7}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{10}}\text{ см}}}}} & 14\text{ см} \\[14pt] \text{Ширина} & 7\text{ см} & \underset{\textcolor{#808080}{38\,:\,2\,-\,14}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{5}}\text{ см}}}}} \\[14pt] \text{Периметр} & \underset{\textcolor{#808080}{(10\,+\,7)\,\cdot\,2}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{34}}\text{ см}}}}} & 38\text{ см} \\[14pt] \text{Площадь} & 70\text{ см}^2 & \underset{\textcolor{#808080}{14\,\cdot\,5}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{70}}\text{ см}^2}}}} \end{array}\]

И \[\begin{array}{lll} & 1) & 2) \\[14pt] \text{Длина} & 3\text{ дм} & \underset{\textcolor{#808080}{36\,:\,2\,-\,8}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{10}}\text{ см}}}}} \\[14pt] \text{Ширина} & 6\text{ см} & 8\text{ см} \\[14pt] \text{Периметр} & \underset{\textcolor{#808080}{(30\,+\,6)\,\cdot\,2}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{72}}\text{ см}}}}} & 36\text{ см} \\[14pt] \text{Площадь} & \underset{\textcolor{#808080}{30\,\cdot\,6}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{180}}\text{ см}^2}}}} & \underset{\textcolor{#808080}{10\,\cdot\,8}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{80}}\text{ см}^2}}}} \end{array}\] \(\textcolor{#808080}{\text{1) }{3}\text{ дм}}\) \(\textcolor{#808080}{{= 30}\text{ см.}}\)

К \[\begin{array}{lll} & 1) & 2) \\[14pt] \text{Длина} & 15\text{ см} & 12\text{ см} \\[14pt] \text{Ширина} & \underset{\textcolor{#808080}{60\,:\,15}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{4}}\text{ см}}}}} & 5\text{ см} \\[14pt] \text{Периметр} & \underset{\textcolor{#808080}{(15\,+\,4)\,\cdot\,2}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{38}}\text{ см}}}}} & \underset{\textcolor{#808080}{(12\,+\,5)\,\cdot\,2}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{34}}\text{ см}}}}} \\[14pt] \text{Площадь} & 60\text{ см}^2 & \underset{\textcolor{#808080}{12\,\cdot\,5}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{60}}\text{ см}^2}}}} \end{array}\]

Л \[\begin{array}{lll} & 1) & 2) \\[14pt] \text{Длина} & 4\text{ м} & \boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{7}}\text{ м}}}} \\[14pt] \text{Ширина} & 7\text{ дм} & \boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{7}}\text{ м}}}} \\[14pt] \text{Периметр} & \underset{\textcolor{#808080}{(40\,+\,7)\,\cdot\,2}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{94}}\text{ дм}}}}} & 28\text{ м} \\[14pt] \text{Площадь} & \underset{\textcolor{#808080}{40\,\cdot\,7}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{280}}\text{ дм}^2}}}} & 49\text{ м}^2 \end{array}\] \(\textcolor{#808080}{\text{1) }{4}\text{ м}}\) \(\textcolor{#808080}{{= 40}\text{ дм.}}\)
\(\textcolor{#808080}{\text{2) Сумма длины}}\) \(\textcolor{#808080}{\text{и ширины равна}}\) \(\textcolor{#808080}{{28 : 2 = 14}\text{ (м), их}}\) \(\textcolor{#808080}{\text{произведение равно }{49\text{ м}^2}\text{;}}\) \(\textcolor{#808080}{\text{подходят }{7}\text{ м}}\) \(\textcolor{#808080}{\text{и }{7}\text{ м.}}\)

М \[\begin{array}{lll} & 1) & 2) \\[14pt] \text{Длина} & \underset{\textcolor{#808080}{800\,:\,5}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{160}}\text{ дм}}}}} & \underset{\textcolor{#808080}{30\,:\,2\,-\,6}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{9}}\text{ см}}}}} \\[14pt] \text{Ширина} & 5\text{ дм} & 60\text{ мм} \\[14pt] \text{Периметр} & \underset{\textcolor{#808080}{(160\,+\,5)\,\cdot\,2}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{330}}\text{ дм}}}}} & 30\text{ см} \\[14pt] \text{Площадь} & 8\text{ м}^2 & \underset{\textcolor{#808080}{9\,\cdot\,6}}{\boxed{\smash[b]{\underset{\hspace{6.5em}}{\textcolor{#e03131}{\mathbf{54}}\text{ см}^2}}}} \end{array}\] \(\textcolor{#808080}{\text{1) }{8\text{ м}^2}\text{ }{= 800\text{ дм}^2}\text{.}}\)
\(\textcolor{#808080}{\text{2) }{60}\text{ мм}}\) \(\textcolor{#808080}{{= 6}\text{ см.}}\)