Ответы к учебнику по математике за 2 класс 2 часть Рудницкая. Числовые выражения. Номер №13

Вычисли.
42 − (6 * 7)
35 + (81 : 9)
(62 + 9) − 13
80 − (44 + 36)
81 : (3 * 3)
(100 − 96) * 8

Ответ

42 − (6 * 7) = 0
35 + (81 : 9) = 44
(62 + 9) − 13 = 58
80 − (44 + 36) = 0
81 : (3 * 3) = 9
(100 − 96) * 8 = 32
Вычисления:
42 − (6 * 7) = 42 − 42 = 0

$\begin{array}{r}\begin{array}{r}—\end{array}\underline{\begin{array}{r}42\\ 42\end{array}}\\ \begin{array}{r}0\end{array}\end{array}$
35 + (81 : 9) = 35 + 9 = 44

$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}35\\ 9\end{array}}\\ \begin{array}{r}44\end{array}\end{array}$
(62 + 9) − 13 = 71 − 13 = 58

$\begin{array}{r}\begin{array}{r}—\end{array}\underline{\begin{array}{r}71\\ 13\end{array}}\\ \begin{array}{r}58\end{array}\end{array}$
80 − (44 + 36) = 80 − 80 = 0

$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}44\\ 36\end{array}}\\ \begin{array}{r}80\end{array}\end{array}$

$\begin{array}{r}\begin{array}{r}—\end{array}\underline{\begin{array}{r}80\\ 80\end{array}}\\ \begin{array}{r}0\end{array}\end{array}$
81 : (3 * 3) = 81 : 9 = 9
(100 − 96) * 8 = 4 * 8 = 32

$\begin{array}{r}\begin{array}{r}—\end{array}\underline{\begin{array}{r}100\\ 96\end{array}}\\ \begin{array}{r}4\end{array}\end{array}$