*Bạn tham khảo nhé!!!!
$\frac{15}{35}$ = $\frac{15:5}{35:5}$ = $\frac{3}{7}$
$\frac{12}{36}$ = $\frac{12:12}{36:12}$ = $\frac{1}{3}$
$\frac{4}{16}$ = $\frac{4:4}{16:4}$ = $\frac{1}{4}$
$\frac{9}{27}$ = $\frac{9:9}{27:9}$ = $\frac{1}{3}$
$\frac{5}{50}$ = $\frac{5:5}{50:5}$ = $\frac{1}{10}$