Выполни задание

Сократи дроби:

а) \(\dfrac{mn-mnk}{mn+mnk}=\) [ ];

б) \(\kern{0.5em}\) \(\cfrac{x^3+2x^2}{x^2y+x^5}=\) [ ] \(\textsf{;}\) \(\newline\,\)

в) \(\kern{0.5em}\) \(\cfrac{3ax+9ay}{6a+12a^3}=\) [ ].