Tính :
a) \(\displaystyle {2 \over 7} + {3 \over 8}\) | \(\displaystyle {4 \over 8} - {2 \over 6}\) |
b) \(\displaystyle {3 \over 4} + {1 \over 6}\) | \(\displaystyle {3 \over 4} - {2 \over 5}\) |
a) \(\displaystyle {2 \over 7} + {3 \over 8} = {{16} \over {56}}+ {21 \over 56} = {{37} \over {56}}\)
\(\displaystyle {4 \over 8} - {2 \over 6} = { 1 \over 2 } - {1 \over 3}= {3 \over {6}}- {2 \over 6} = {1 \over 6}\)
b) \(\displaystyle {3 \over 4} + {1 \over 6} = {{18 } \over {24}} + {4 \over 24} = {{22} \over {24}} = {{11} \over {12}}\)
\(\displaystyle {
-- Mod Toán lớp 4