bài 17:a)$\frac{5}{64}$ b)$\frac{1}{2}$
c)$\frac{7}{6}$ d)$\frac{3}{2}$
e)-3
Bài 18:
a)$\frac{1}{3}$ b)$\frac{7}{12}$
c)$\frac{3}{2}$
Bài 20:
$\frac{-9}{33}$ =$\frac{3}{-11}$
$\frac{15}{9}$= $\frac{5}{3}$
$\frac{-12}{19}$=$\frac{60}{-95}$
Bài 21:$\frac{14}{20}$
Bài 22:$\frac{2}{3}$ = $\frac{40}{60}$ $\frac{3}{4}$ = $\frac{45}{60}$$\frac{4}{5}$ = $\frac{48}{60}$ $\frac{5}{6}$ = $\frac{50}{60}$
(mỏi tay + não quá :v)
