Решебник по математике 4 класс Петерсон рабочая тетрадь Часть 1, 2, 3 Часть 1 | Страница 19

\[\boxed{Страница\ 19.}\]

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

\[1.\]

\[4 < k < 8\]

\[k = \left\{ 5;6;7 \right\}.\]

\[4 < k \leq 7\]

\[k = \left\{ 5;6;7 \right\}.\]

\[5 \leq k \leq 7\]

\[k = \left\{ 5;6;7 \right\}.\]

\[5 \leq k < 8\]

\[k = \left\{ 5;6;7 \right\}.\]

\[Все\ неравенства\ имеют\ \]

\[одинаковое\ решение.\]

\[2.\]

\[\textbf{а)}\ n \geq 8\]

\[n = \left\{ 8;9;10;\ldots \right\}.\]

\[\textbf{б)}\ 7 \leq m < 11\]

\[m = \left\{ 7;8;9;10 \right\}.\]

\[3.\]

\[\textbf{а)}\ 2 \cdot (3 \cdot d + d)\ м - периметр\ \]

\[прямоугольника.\]

\[\textbf{б)}\ f \cdot (f - 8)\ см^{2} - площадь\ \]

\[прямоугольника.\]

\[4.\]

\[A = \left\{ 7;8;9;\ldots \right\};\ \ B = \left\{ 6;7;8 \right\}.\]

\[A \cap B = \left\{ 7;8 \right\}.\]

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

\[1.\ \]

\[1 < b < 6\]

\[b = \left\{ 2;3;4;5 \right\}.\]

\[1 < b \leq 5\]

\[b = \left\{ 2;3;4;5 \right\}.\]

\[2 \leq b \leq 5\]

\[b = \left\{ 2;3;4;5 \right\}.\]

\[2 \leq b < 6\]

\[b = \left\{ 2;3;4;5 \right\}.\]

\[Все\ неравенства\ имеют\ \]

\[одинаковое\ решение.\]

\[2.\]

\[\textbf{а)}\ c \leq 6\]

\[c = \left\{ 0;1;2;3;4;5;6 \right\}.\]

\[\textbf{б)}\ 7 \leq y < 11\]

\[y = \left\{ 7;8;9;10 \right\}.\]

\[3.\ \]

\[\textbf{а)}\ 2 \cdot (k + k\ :4)\ см - периметр\ \]

\[прямоугольника.\]

\[\textbf{б)}\ n \cdot (n + 3)\ дм^{2} - площадь\ \]

\[прямоугольника.\]