Question

bai 3 sgk/8

Answer 1

a. \(x=\dfrac{2}{-7}\) và \(y=\dfrac{-3}{11}\)

\(\dfrac{2}{-7}=\dfrac{-2}{7}=\dfrac{-22}{77}\)

\(\dfrac{-3}{11}=\dfrac{-21}{77}\)

Vì -22 < -21 => \(\dfrac{-22}{77}< \dfrac{-21}{77}\) =>\(\dfrac{2}{-7}< \dfrac{-3}{11}\) => \(x< y\)

b. \(x=\dfrac{-213}{300}\) và \(y=\dfrac{18}{-25}\)

\(\dfrac{-213}{300}=\dfrac{-71}{100}\)

\(\dfrac{18}{-25}=\dfrac{-18}{25}=\dfrac{-72}{100}\)

Vì -71 > -72 => \(\dfrac{-71}{100}>\dfrac{-72}{100}\) => \(\dfrac{-213}{300}>\dfrac{18}{-25}\) => \(x>y\)

c. \(x=0,75\) và \(y=\dfrac{-3}{4}\)

\(0,75=\dfrac{3}{4}\)

Vì \(\dfrac{3}{4}>\dfrac{-3}{4}\) => \(0,75>\dfrac{-3}{4}\)