ГДЗ по математике 3 класс Петерсон рабочая тетрадь Часть 1, 2, 3 Часть 1 | Страница 47

\[\boxed{\mathbf{Страница\ 47.\ }\mathbf{Еуроки\ - \ ДЗ\ без\ мороки}}\]

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

\[\mathbf{1.}\]

\[7599 + 1 = 7\ 600\]

\[83\ 000 - 1 = 82\ 999\]

\[54\ 906 + 2000 = 56\ 906\]

\[679\ 850 - 30\ 000 = 649\ 850\]

\[(4997 + 560) + (3 + 40) =\]

\[= 5000 + 600 = 5600\]

\[\mathbf{2.}\]

\[x \cdot 7 = 98\]

\[x = 98\ :7\]

\[x = 14.\]

\[x\ :30 = 18\]

\[x = 18 \cdot 30\]

\[x = 540.\]

\[75\ :x = 15\]

\[x = 75\ :15\]

\[x = 5.\]

\[\mathbf{3.}\]

\[\textbf{а)}\ 2326 + 80\ 968 + 53 + 598\ 728 =\]

\[= 682\ 075\]

\[\textbf{б)}\ 8\ 104\ 303 -^{2}\left( 500\ 000 -^{1}235 \right) =\]

\[= 7\ 604\ 538\]

\[\mathbf{4.}\]

\[1010,\ 1009,\ 1007,\ 1004,\ \mathbf{1000,\ }\]

\[\mathbf{995,\ 989,\ 982.}\]

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

\[\mathbf{1.}\]

\[50\ 499 + 1 = 50\ 500\]

\[69\ 000 - 1 = 68\ 999\]

\[253\ 018 + 6000 = 259\ 018\]

\[9\ 485\ 025 - 80\ 000 = 9\ 405\ 025\]

\[354 + (7998 + 46) + 2 =\]

\[= 8000 + 400 = 8400\]

\[\mathbf{2.\ }\]

\[x\ :5 = 120\]

\[x = 120 \cdot 5\]

\[x = 600.\]

\[40 \cdot x = 760\]

\[x = 760\ :40\]

\[x = 19.\]

\[58\ :x = 29\]

\[x = 58\ :29\]

\[x = 2.\]