Ta có : MSC :10
\(\dfrac{2}{5}=\dfrac{2\times2}{5\times2}=\dfrac{4}{10};\dfrac{1}{2}=\dfrac{1\times5}{2\times5}=\dfrac{5}{10}\\ \dfrac{4}{10}< \dfrac{5}{10}\\ \Rightarrow\dfrac{2}{5}< \dfrac{1}{2}\)
\(\dfrac{2}{5}và\dfrac{1}{2}\)
\(\dfrac{2}{5}=\dfrac{2\times2}{5\times2}=\dfrac{4}{10};\)\(\dfrac{1}{2}=\dfrac{1\times5}{2\times5}=\dfrac{5}{10}\)
Hùng ăn \(\dfrac{4}{10}\) và Dũng ăn \(\dfrac{5}{10}\)
Vậy Dũng ăn nhiều bánh hơn