Question

Điền dầu thích hợp (>, <, =) vào chỗ chấm    

      10 + 5  .?.  12 + 3

      80 + 4  .?.  82 + 3

      7 + 3 + 5  .?.  7 + 5 + 3

      19 + 1 + 6  .?.  19 + 5 + 1

Answer 1

\(\begin{array}{l}\begin{array}{*{20}{l}}{\underbrace {10 + 5}_{15}\,\,\, = \,\,\,\;\underbrace {12 + 3}_{15}}\\{\underbrace {80 + 4}_{84}\;\,\,\, < \,\,\,\;\underbrace {82 + 3}_{85}}\\{\underbrace {7 + 3 + 5}_{15}\,\,\, = \,\,\,\;\;\underbrace {7 + 5 + 3}_{15}}\end{array}\\\underbrace {19 + 1 + 6}_{26}\,\,\, > \,\,\,\;\underbrace {19 + 5 + 1}_{25}\end{array}\)

Answer 2

10+5 = 12+3

80+4 <82+3

7+3+5 = 7+5+3

19+1+6>19+5+1