\(4\dfrac{1}{2}:2\dfrac{1}{2}=\dfrac{9}{2}:\dfrac{5}{2}=\dfrac{9}{2}\)x\(\dfrac{2}{5}=\)\(\dfrac{18}{10}=\dfrac{9}{5}\)
\(1\dfrac{1}{2}+\dfrac{1}{2}=\dfrac{3}{2}+\dfrac{1}{2}=\dfrac{3+1}{2}=\dfrac{4}{2}=2\)
Mà: \(\dfrac{9}{5}< 2\)
Vậy:\(4\dfrac{1}{2}:2\dfrac{1}{2}< 1\dfrac{1}{2}+\dfrac{1}{2}\)