6 1/2- 2 4/3 -1 3/5 -1 (Enam 1 per 2 dikurang 2 4 per 3 dikurang 1 3 per 5 dikurang 1)

= (6-2-1)[tex] \frac{1}{2} - \frac{4}{3} - \frac{3}{5} - \frac{1}{1} [/tex]
= 3 [tex] \frac{15 - 10 - 6 - 30}{30} [/tex]
= - [tex] \frac{31}{30} [/tex]3