Bài 4:
a.
$\frac{1}{2}=\frac{2}{4}< \frac{3}{4}$
$\Rightarrow x< y$
b.
$\frac{2}{-5}=\frac{-2}{5}=\frac{-14}{35}$
$\frac{-3}{7}=\frac{-15}{35}< \frac{-14}{35}$
$\Rightarrow y < x$
c.
$x=\frac{-3}{5}<0$ do $-3<0; 5>0$
Bài 5:
a.
$\frac{2017}{2018}< 1< \frac{14}{13}$
$\Rightarrow x< y$
b.
$x=\frac{-45}{81}=\frac{-5}{9}=\frac{-555}{999}> \frac{-777}{999}$
Hay $x> y$
c.
$x=-2\frac{1}{5}=\frac{-11}{5}=\frac{-110}{50}=y$
d.
$x=\frac{17}{20}> \frac{16}{20}$ hay $x> \frac{4}{5}=0,8> 0,75$
Bài 4:
a: \(\dfrac{1}{2}=\dfrac{2}{4}< \dfrac{3}{4}\)
b: \(\dfrac{-2}{5}=\dfrac{-14}{35}>\dfrac{-15}{35}=\dfrac{-3}{7}\)
c: \(\dfrac{-3}{5}< 0\)
