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\(\underbrace {5\, + 7}_{12}\;\;\,\, = \,\,\,\,\;\underbrace {7 + 5}_{12}\)
\( \underbrace {5 + 8}_{13}\;\;\;\, > \;\;\;\underbrace {8 + 3}_{11}\)
\(\underbrace {9 + 2}_{11}\;\;\; < \;\;\,\,\underbrace {3 + 9}_{12}\)
\(\underbrace {6 + 8}_{14}\;\;\; = \,\,\,\;\underbrace {8 + 6}_{14}\)
\(\begin{array}{l}\underbrace {7 + 9}_{16}\,\,\, < \,\,\,17\\\underbrace {3\,\, + \,\,8}_{11}\,\,\, > \,\,\,10\\\underbrace {5 + 7}_{12}\;\,\,\, = \,\,\,\;12\end{array}\)
\(\underbrace {9 + 2}_{11}\,\,\, < \,\,\,\underbrace {9 + 3}_{12}\) \(\underbrace {3\,\, + \,\,7}_{10}\,\,\, = \,\,\,\underbrace {17 - 7}_{10}\)
\(\underbrace {11 - 2}_9\;\,\,\, > \,\,\,\;\underbrace {11 - 3}_8\) \(\underbrace {15 - 10}_5\,\,\, < \,\,\,\underbrace {15 - 9}_6\)
Phép tính: 7 + 9 = 16
Trả lời: Vườn nhà Tùng có tất cả 16 cây na và cây xoài.
\(\begin{array}{*{20}{c}}{a)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{43}\\{25}\end{array}}\\\hline{\,\,\,\,68}\end{array}\) \(\begin{array}{*{20}{c}}{b)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{55}\\{13}\end{array}}\\\hline{\,\,\,68}\end{array}\) \(\begin{array}{*{20}{c}}{c)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{\,\,\,7}\\{61}\end{array}}\\\hline{\,\,\,\,68}\end{array}\)
v:9=7
v=7x9
v=63
chúc bn hok tốt
v = 9 x 7 = 63