Условие:

Выполни сложение.
(16 + 53) + 9
(67 + 18) + 15
24 + (16 + 20)
37 + (32 + 28)
(21 + 9) + (22 + 10)
(64 + 6) + (12 + 18)
(8 + 35) + (7 + 34)
(52 + 4) + (19 + 1)

(16 + 53) + 9 = 78
(67 + 18) + 15 = 100
24 + (16 + 20) = 60
37 + (32 + 28) = 97
(21 + 9) + (22 + 10) = 62
(64 + 6) + (12 + 18) = 100
(8 + 35) + (7 + 34) = 84
(52 + 4) + (19 + 1) = 76
Вычисления:
(16 + 53) + 9 = 69 + 9 = 78
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}16\\ 53\end{array}}\\ \begin{array}{r}69\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}69\\ 9\end{array}}\\ \begin{array}{r}78\end{array}\end{array}$
(67 + 18) + 15 = 85 + 15 = 100
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}67\\ 18\end{array}}\\ \begin{array}{r}85\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}85\\ 15\end{array}}\\ \begin{array}{r}100\end{array}\end{array}$
24 + (16 + 20) = 24 + 36 = 60
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}16\\ 20\end{array}}\\ \begin{array}{r}36\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}24\\ 36\end{array}}\\ \begin{array}{r}60\end{array}\end{array}$
37 + (32 + 28) = 37 + 60 = 97
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}32\\ 28\end{array}}\\ \begin{array}{r}60\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}37\\ 60\end{array}}\\ \begin{array}{r}97\end{array}\end{array}$
(21 + 9) + (22 + 10) = 30 + 32 = 62
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}21\\ 9\end{array}}\\ \begin{array}{r}30\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}22\\ 10\end{array}}\\ \begin{array}{r}32\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}30\\ 32\end{array}}\\ \begin{array}{r}62\end{array}\end{array}$
(64 + 6) + (12 + 18) = 70 + 30 = 100
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}64\\ 6\end{array}}\\ \begin{array}{r}70\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}12\\ 18\end{array}}\\ \begin{array}{r}30\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}70\\ 30\end{array}}\\ \begin{array}{r}100\end{array}\end{array}$
(8 + 35) + (7 + 34) = 43 + 41 = 84
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}8\\ 35\end{array}}\\ \begin{array}{r}43\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}7\\ 34\end{array}}\\ \begin{array}{r}41\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}43\\ 41\end{array}}\\ \begin{array}{r}84\end{array}\end{array}$
(52 + 4) + (19 + 1) = 56 + 20 = 76
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}52\\ 4\end{array}}\\ \begin{array}{r}56\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}19\\ 1\end{array}}\\ \begin{array}{r}20\end{array}\end{array}$
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}56\\ 20\end{array}}\\ \begin{array}{r}76\end{array}\end{array}$