Tính:
a) \(\displaystyle{5 \over 2} - {3 \over 2}\) b) \(\displaystyle {4 \over 5} - {2 \over 5}\)
c) \(\displaystyle{{13} \over 4} - {7 \over 4}\) d) \(\displaystyle{{27} \over {41}} - {{15} \over {41}}\)
a) \(\displaystyle{5 \over 2} - {3 \over 2} = {2 \over 2} = 1\) b) \(\displaystyle {4 \over 5} - {2 \over 5} = {2 \over 5}\)
c) \(\displaystyle{{13} \over 4} - {7 \over 4} = {6 \over 4} = {3 \over 2}\) d) \(\displaystyle{{27} \over {41}} - {{15} \over {41}} = {{12} \over {41}}\)
-- Mod Toán lớp 4