Question

So Sánh

1. \(\dfrac{-2}{3}\) và -0,65

2. \(\dfrac{12}{15}\) và \(\dfrac{-20}{25}\)

Mong các bạn giúp đỡ mình nhé

Answer 1

1) Ta có :

\(\dfrac{-2}{3}=\dfrac{-40}{60}\) ; \(-0,65=\dfrac{-39}{60}\)

Vì -40 < -39 nên \(\dfrac{-40}{60}< \dfrac{-39}{60}\) => \(\dfrac{-2}{3}< 0,65\)

Vậy \(\dfrac{-2}{3}< 0,65\)

2) Ta có :

\(\dfrac{12}{15}=\dfrac{4}{5}\) ; \(\dfrac{-20}{25}=\dfrac{-4}{5}\)

Vì 4 > -4 nên \(\dfrac{4}{5}>\dfrac{-4}{5}\) => \(\dfrac{12}{15}>\dfrac{-20}{25}\)

Vậy \(\dfrac{12}{15}>\dfrac{-20}{25}\)

Answer 2

\(-\dfrac{2}{3}=-0,\left(6\right)< -0,65\)

\(\left\{{}\begin{matrix}\dfrac{12}{15}>0\\-\dfrac{20}{25}< 0\end{matrix}\right.\Rightarrow\dfrac{12}{15}>-\dfrac{20}{25}\)