Решебник по математике 5 класс Ерина Виленкин рабочая тетрадь Часть 1, 2 Часть 1 | Страница 64

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

\[\textbf{а)}\ (78 + 22)\ :2 = 50\]

\[1)\ 78 + 22 = 100\]

\[2)\ 100\ :2 = 50\]

\[\textbf{б)}\ 78 + 22\ :2 = 89\]

\[1)\ 22\ :2 = 11\]

\[2)\ 78 + 11 = 89\]

\[\textbf{в)}\ 319 - (42 + 68)\ :10 = 308\]

\[1)\ 42 + 68 = 110\]

\[2)\ 110\ :10 = 11\]

\[3)\ 319 - 11 = 308\]

\[\textbf{г)}\ 927 - 139 + 65\ :5 = 901\]

\[1)\ 65\ :5 = 13\]

\[2)\ 927 - 139 = 788\]

\[3)\ 788 + 13 = 901\]

\[\textbf{д)}\ 418 \cdot 5 + 315\ :5 = 2153\]

\[1)\ 418 \cdot 5 = 2090\]

\[2)\ 315\ :5 = 63\]

\[3)\ 2090 + 63 = 2153\]

\[\textbf{е)}\ 994\ :(49 + 22) - 10 = 4\]

\[1)\ 49 + 22 = 71\]

\[2)\ 994\ :71 = (710 + 284)\ :71 =\]

\[= 10 + 4 = 14\]

\[3)\ 14 - 10 = 4\]

\[1)\ 35\ 148\ :348 = 101\]

\[2)\ 1674\ :837 = 2\]

\[3)\ 101 - 2 = 99\]

\[4)\ 936\ 439 - 99 = 936\ 340\]

\[1)\ 13\ 546 - 9878 = 3668\]

\[2)\ 100\ 000 - 84\ 364 = 15\ 636\]

\[3)\ 3668 \cdot 326 = 1\ 195\ 768\]

\[4)\ 15\ 636 \cdot 502 = 7\ 849\ 272\]

\[5)\ 1\ 195\ 768 + 7\ 849\ 272 =\]

\[= 9\ 045\ 040\]