Răspuns :
[tex] \frac{1}{60} : ( - \frac{1}{30}) - ( - \frac{6}{10}) = - \frac{1}{60} : - \frac{1}{30} + \frac{6}{10} = - \frac{1}{60} \times 30 + \frac{6}{10} = - \frac{1}{2} + \frac{6}{10} = \frac{ - 5 + 6}{10} = \frac{1}{10} [/tex]