\[\boxed{Стр.\ \mathbf{89}\text{.\ \ }\mathbf{ОК\ ГДЗ\ - \ домашка\ на\ 5}}\]
\[\boxed{\mathbf{1}.}\]
\[7 \cdot 7 - 13 = 49 - 13 = 36\]
\[40 - 7 \cdot 4 = 40 - 28 = 12\]
\[(21 + 21)\ :6 = 42\ :6 = 7\]
\[6 \cdot 8 - 23 = 48 - 23 = 25\]
\[7 \cdot 9 - 43 = 63 - 43 = 20\]
\[(23 - 16) \cdot 9 = 7 \cdot 9 = 63\]
\[7 \cdot 9 - 7 \cdot 5 = 7 \cdot (9 - 5) =\]
\[= 7 \cdot 4 = 28\]
\[8 \cdot 10 - 7 \cdot 8 = 8 \cdot (10 - 7) =\]
\[= 8 \cdot 3 = 24\]
\[10 \cdot (56 - 50) = 10 \cdot 6 = 60\]
\[\boxed{\mathbf{2}.}\]
\[Делимое\] | \[24\] | \[24\] | \[18\] | \[49\] | \[56\] | \[72\] |
---|---|---|---|---|---|---|
\[Делитель\] | \[8\] | \[6\] | \[9\] | \[7\] | \[7\] | \[8\] |
\[Частное\] | \[3\] | \[4\] | \[2\] | \[7\] | \[8\] | \[9\] |
\[\boxed{\mathbf{3}.}\]
\[12\ :3 = 4\ (кг) - груза\ \]
\[доставит\ один\ квадрокоптер.\]
\[Ответ:4\ кг.\]
\[\boxed{\mathbf{4}.}\]
\[3 \cdot 6 + 4 \cdot 3 = 3 \cdot (6 + 4) =\]
\[= 3 \cdot 10 = 30\ (человек) - было\ \]
\[за\ столиками.\]
\[Ответ:30\ человек.\]
\[\boxed{\mathbf{5}.}\]
\[1)\ 5 + 2 = 7\ (см) - длина\ \]
\[второго\ отрезка.\]
\[2)\ 5 \cdot 2 = 10\ (см) - длина\ \]
\[третьего\ отрезка.\]
\[3)\ 10 - 7 = 3\ (см) - третий\ \]
\[отрезок\ длиннее\ второго.\]
\[\boxed{\mathbf{6}.}\]
\[25 + 29 = 54\]
\[21 - 14 = 7\]
\[38 + 13 = 51\]
\[43 - 25 = 18\]
\[57 + 26 = 93\]
\[40 - 17 = 23\]
\[64 + 28 = 92\]
\[54 - 28 = 26\]
\[\boxed{\mathbf{7}.}\]
\[20 + 16 - 9 = 36 - 9 = 27\]
\[38 - 26 - 4 = 12 - 4 = 8\]
\[75 - 46 + 6 = 29 + 6 = 35\]
\[59 - 7 - 3 = 52 - 3 = 49\]
\[\boxed{\mathbf{8}.}\]
\[7 \cdot 3 + 9 = 21 + 9 = 40\]
\[4 \cdot 7 - 14 = 28 - 14 = 14\]
\[9\ :3 + 4 = 3 + 4 = 7\]
\[14\ :2 \cdot 7 = 7 \cdot 7 = 49\]
\[49 - 8 \cdot 5 = 49 - 40 = 9\]
\[30 - (19 + 7) = 30 - 26 = 4\]
\[\boxed{\mathbf{Вопрос}.}\]
\[72\ :9 = 8\]
\[8 \cdot 8 = 64 < 60 + 5 = 65\]
\[81\ :9 = 9 < 10\]
\[\boxed{\mathbf{Задание\ на\ полях}.\ Ребусы}\]