$\text{Quy đồng mẫu số:}$
$\text{Ta có: $\dfrac{1}{4}$ = $\dfrac{9}{4.9}$ = $\dfrac{9}{36}$}$
`2/9 = \frac{2.4}{9.4} = 8/36`
$\text{Vì $\dfrac{9}{36}$ > $\dfrac{8}{36}$}$
$\text{⇒ $\dfrac{1}{4}$ > $\dfrac{2}{9}$}$
$\text{⇒ Mẹ cho chị nhiều quýt hơn}$