$1:$
$\frac{75}{125}$ $=$ $\frac{75 : 25}{125:25}$ $=$ $\frac{3}{5}$
$\frac{1717}{1313}$ $=$ $\frac{1717:101}{1313:101}$ $=$ $\frac{17}{13}$
$\frac{203203}{207207}$ $=$ $\frac{203203:1001}{207207:1001}$ =$\frac{203}{207}$
$2:$
$\frac{25}{35}$ $=$ $\frac{25:5}{35:5}$ $=$ $\frac{5}{7}$
$\frac{19}{27}$ $=$ $\frac{19}{27}$
$\frac{120}{140}$ $=$ $\frac{120:20}{140:20}$ $=$ $\frac{6}{7}$
$\frac{49}{35}$ = $\frac{49:7}{35:7}$ $=$$\frac{7}{5}$
$\frac{16}{28}$ $=$ $\frac{16:4}{28:4}$ $=$ $\frac{4}{7}$
$\frac{85}{149}$ $=$$\frac{85}{149}$
Vậy phân số $\frac{25}{35}$ $=$ phân số $\frac{5}{7}$
$@Yuu$
