2 câu trả lời
${2,2}$ ${:}$ ${4,0}$ ${=}$ $\dfrac{22}{10}$ ${:}$ $\dfrac{40}{10}$
${=}$ $\dfrac{22}{10}$ ${×}$ $\dfrac{10}{40}$
${=}$ $\dfrac{11}{20}$
$\text{Vậy}$ ${2,2}$ ${:}$ ${4,0}$ ${=}$ $\dfrac{11}{20}$
${2,2}$ ${:}$ ${4,0}$ ${=}$ $\dfrac{22}{10}$ ${:}$ $\dfrac{40}{10}$
${=}$ $\dfrac{22}{10}$ ${×}$ $\dfrac{10}{40}$
${=}$ $\dfrac{11}{20}$
$\text{Vậy}$ ${2,2}$ ${:}$ ${4,0}$ ${=}$ $\dfrac{11}{20}$