Сократите дроби: 15/50. 42/49. 102/510.

[tex]\displaystyle \frac{15}{50}=\frac{3*5}{10*5}=\frac{3}{10}[/tex]

[tex]\displaystyle \frac{42}{49}=\frac{6*7}{7*7}=\frac{6}{7}[/tex]

[tex]\displaystyle \frac{102}{510}=\frac{1*102}{5*102}=\frac{1}{5}[/tex]