к) 6$$\frac{3}{10}$$ - $$\frac{11}{15}$$ = 6$$\frac{9}{30}$$ - $$\frac{22}{30}$$ = 5$$\frac{39}{30}$$ - $$\frac{22}{30}$$ = 5$$\frac{17}{30}$$
Ответ: 5$$\frac{17}{30}$$