Решебник по математике 2 класс Моро Часть 1, 2 Часть 2 | Страница 17

\[\boxed{Стр.\ \mathbf{17}\text{.\ \ }\mathbf{ОК\ ГДЗ\ - \ домашка\ на\ 5}}\]

\[\boxed{\mathbf{1}.}\]

\[75 + 12 = 87\]

\[87 - 12 = 75\]

\[94 - 32 = 62\]

\[62 + 32 = 94\]

\[56 + 24 = 80\]

\[80 - 24 = 56\]

\[14 - 2 = 12\]

\[12 + 2 = 14\]

\[\boxed{\mathbf{2}.}\]

\[40 - (8 + 7) = 40 - 15 = 25\]

\[50 - (9 - 6) = 50 - 3 = 47\]

\[86 - (30 - 10) = 86 - 20 = 66\]

\[42 - (20 + 2) = 42 - 22 = 20\]

\[\boxed{\mathbf{3}.}\]

\[70 = 10 + 60\]

\[100 = 10 + 90\]

\[90 = 10 + 80\]

\[86 = 80 + 6\]

\[92 = 90 + 2\]

\[\boxed{\mathbf{4}.}\]

\[10 + 10 + 10 = 30\ (м) - обоев\ \]

\[купил\ папа.\]

\[Ответ:30\ м.\]

\[\boxed{\mathbf{5}.}\]

\[1)\ 5 + 2 = 7\ (мин) - от\ \]

\[булочной\ до\ дома.\]

\[2)\ 5 + 7 = 12\ (мин) - на\ весь\ \]

\[путь.\]

\[Ответ:12\ мин.\]

\[\boxed{\mathbf{6}.}\]

\[Периметры\ фигур.\]

\[№1:\]

\[25 + 15 + 30 = 40 + 30 = 70\ мм.\]

\[№2:\]

\[30 + 15 + 30 + 13 =\]

\[= 60 + 28 = 88\ мм.\]

\[№3:\]

\[25 + 20 + 25 + 20 =\]

\[= 50 + 40 = 90\ мм.\]

\[\boxed{\mathbf{7}.}\]

\[\boxed{\mathbf{Вопрос}.}\]

\[37 + 8 = 43 + 2\]

\[45 = 45\]

\[82 + 7 > 89 - 3\]

\[89 > 86\]

\[40 < 52 - 8\]

\[40 < 44\]

\[50 < 46 + 9\]

\[50 < 55\]

\[\boxed{\mathbf{Задание\ на\ полях}.\ Набери\ 17.}\]

\[4 + 7 + 6 = 17\]

\[6 + 8 + 3 = 17\]

\[1 + 9 + 7 = 17\]

\[2 + 8 + 7 = 17\]