Ex:
[tex]a = ( - \frac{34}{15} + \frac{17}{12} ) \div \frac{17}{5} \\ \\ a = ( - \frac{34}{15} + \frac{17}{12} ) \times \frac{5}{17} \\ \\ a = - \frac{17}{20} \times \frac{5}{17} \\ a = - \frac{1}{4} [/tex]
la b nu știu:/
