1) 18 + 18 = 36
2) 10 + 5 < 25
3) 45 − 35 = 9
4) 16 > 25 − 5
Вычисления:
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}18\\ 18\end{array}}\\ \begin{array}{r}38\end{array}\end{array}$
10 + 5 < 25
1) 10 + 5 = 15
2) 15 < 25
$\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}45\\ 35\end{array}}\\ \begin{array}{r}10\end{array}\end{array}$
16 > 25 − 5
1) 25 − 5 = 20
2) 16 < 20