2 câu trả lời
Lời giải:
Quy đồng:
`8/4= (8xx5)/(4xx5) = 40/20`
`4/5=(4xx4)/(5xx4)=16/20`
Vì: `40 > 16` Nên: `40/20>16/20`
Vậy: `8/4>4/5`
`@``Don``na`
$\text{MSC:20}$
$\text{$\dfrac{8}{4}$=$\dfrac{8×5}{4×5}$=$\dfrac{40}{20}$}$
$\text{$\dfrac{4}{5}$=$\dfrac{4×4}{5×4}$=$\dfrac{16}{20}$}$
$\text{Vì 40>16}$
$\text{⇒$\dfrac{40}{20}$>$\dfrac{16}{20}$}$
$\text{Hay $\dfrac{8}{4}$>$\dfrac{4}{5}$}$