reshalka.com

ГДЗ учебник по математике 2 класс Петерсон. Урок 12. Вычитание числа из суммы. Номер №7

Решение а

1) 348 + 418 = 766

$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}348\\ 418\end{array}}\\ \begin{array}{r}766\end{array}\end{array}$

2) 766 − 279 = 487

$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}766\\ 279\end{array}}\\ \begin{array}{r}487\end{array}\end{array}$

3) 487 − 348 = 139

$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}487\\ 348\end{array}}\\ \begin{array}{r}139\end{array}\end{array}$

Ответ:

Решение б

1) 812 − 315 = 497

$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}812\\ 315\end{array}}\\ \begin{array}{r}497\end{array}\end{array}$

2) 497 + 248 = 745

$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}497\\ 248\end{array}}\\ \begin{array}{r}745\end{array}\end{array}$

3) 812 − 136 = 676

$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}812\\ 136\end{array}}\\ \begin{array}{r}676\end{array}\end{array}$

4) 812 − 745 = 67

$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}812\\ 745\end{array}}\\ \begin{array}{r}67\end{array}\end{array}$

5) 676 − 497 = 179

$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}676\\ 497\end{array}}\\ \begin{array}{r}179\end{array}\end{array}$

6) 745 − 676 = 69

$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}745\\ 676\end{array}}\\ \begin{array}{r}69\end{array}\end{array}$

Ответ: