Tính rồi rút gọn:
a) \(\displaystyle{{17} \over 6} - {2 \over 6}\) b) \(\displaystyle{{16} \over {15}} - {{11} \over {15}}\) c) \(\displaystyle{{19} \over {12}} - {{13} \over {12}}\)
a) \(\displaystyle{{17} \over 6} - {2 \over 6} = {{17 - 2} \over 6} = {{15} \over 6} = {5 \over 2}\)
b) \(\displaystyle{{16} \over {15}} - {{11} \over {15}} = {{16 - 11} \over {15}} = {5 \over {15}} = {1 \over 3}\)
c) \(\displaystyle{{19} \over {12}} - {{13} \over {12}} = {{19 - 13} \over {12}} = {6 \over {12}} = {1 \over 2}\)
-- Mod Toán lớp 4