SGK Kết nối tri thức với cuộc sống - Trang 72
9 tháng 4 2023 lúc 18:19
\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{28}\\ {\,\,\,3}\end{array}}\\\hline{\,\,\,\,31}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{78}\\{\,\,9}\end{array}}\\\hline{\,\,\,87}\end{array}\)
\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{57}\\{\,\,7}\end{array}}\\\hline{\,\,\,64}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{13}\\{\,\,7}\end{array}}\\\hline{\,\,\,20}\end{array}\)
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