Ответы к учебнику по математике за 2 класс 2 часть Рудницкая. Умножение числа 8. Умножение и деление на 8. Восьмая часть числа. Номер №32

Вычисли.
(6 * 7) * 1
31 + 49
21 : (90 − 83)
90 + 10
(56 : 7) :1
6 * (40 − 31)
49 − 31
58 + 42​​​​​​​
6 + 38

Ответ

(6 * 7) * 1 = 42
31 + 49 = 80
21 : (90 − 83) = 3
90 + 10 = 100
(56 : 7) :1 = 8
6 * (40 − 31) = 54
49 − 31 = 18
58 + 42​​​​​​​ = 100
6 + 38 = 44
Вычисления:
(6 * 7) * 1 = 42 * 1 = 42
31 + 49 = 80

$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}31\\ 49\end{array}}\\ \begin{array}{r}80\end{array}\end{array}$
21 : (90 − 83) = 21 : 7 = 3

$\begin{array}{r}\begin{array}{r}—\end{array}\underline{\begin{array}{r}90\\ 83\end{array}}\\ \begin{array}{r}7\end{array}\end{array}$
90 + 10 = 100

$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}90\\ 10\end{array}}\\ \begin{array}{r}100\end{array}\end{array}$
(56 : 7) :1 = 8 : 1 = 8
6 * (40 − 31) = 6 * 9 = 54

$\begin{array}{r}\begin{array}{r}—\end{array}\underline{\begin{array}{r}40\\ 31\end{array}}\\ \begin{array}{r}9\end{array}\end{array}$
49 − 31 = 18

$\begin{array}{r}\begin{array}{r}—\end{array}\underline{\begin{array}{r}49\\ 31\end{array}}\\ \begin{array}{r}18\end{array}\end{array}$
58 + 42​​​​​​​ = 100

$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}58\\ 42\end{array}}\\ \begin{array}{r}100\end{array}\end{array}$
6 + 38​​​​​​​ = 44

$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}6\\ 38\end{array}}\\ \begin{array}{r}44\end{array}\end{array}$