23. Среди дробей 5/10; 10/20; 7/21; 6/18; 3/9; 12/24; 25/50; 21/63 найдите дроби, равные: 1/2; 1/3

Сократим дроби:

• \(\dfrac{5}{10}=\dfrac12\), \(\dfrac{10}{20}=\dfrac12\), \(\dfrac{12}{24}=\dfrac12\), \(\dfrac{25}{50}=\dfrac12\);
• \(\dfrac{7}{21}=\dfrac13\), \(\dfrac{6}{18}=\dfrac13\), \(\dfrac{3}{9}=\dfrac13\), \(\dfrac{21}{63}=\dfrac13\).

Ответ: \(\dfrac12\): \(\dfrac{5}{10},\dfrac{10}{20},\dfrac{12}{24},\dfrac{25}{50}\); \(\dfrac13\): \(\dfrac{7}{21},\dfrac{6}{18},\dfrac{3}{9},\dfrac{21}{63}\).