28. Сократите дробь: а) 4a²/(6ac); б) 7x²y/(21xy²); в) 56m²n⁵/(35mn⁵); г) 25p⁴q/(100p⁵q).

а) \(\dfrac{4a^2}{6ac}=\dfrac{2a}{3c}\).

б) \(\dfrac{7x^2y}{21xy^2}=\dfrac{x}{3y}\).

в) \(\dfrac{56m^2n^5}{35mn^5}=\dfrac{8m}{5}\).

г) \(\dfrac{25p^4q}{100p^5q}=\dfrac{1}{4p}\).

Ответ: а) \(\dfrac{2a}{3c}\); б) \(\dfrac{x}{3y}\); в) \(\dfrac{8m}{5}\); г) \(\dfrac{1}{4p}\).