Explicație pas cu pas:
[tex] \frac{1}{3} - \frac{2}{3} = \frac{1 - 2}{3} = - \frac{1}{3} [/tex]
[tex] - \frac{1}{3} + ( - \frac{2}{3} ) = - \frac{3}{3} = - 1[/tex]
[tex] - \frac{1}{3} - ( - \frac{2}{3} ) = - \frac{1}{3} + \frac{2}{3} = \frac{1}{3} [/tex]
[tex] \frac{1}{5} + ( - \frac{3}{15} ) = \frac{1}{5} - \frac{3}{15} = \frac{1}{5} - \frac{1}{5} = 0[/tex]
[tex] - \frac{1}{2} + ( - \frac{3}{8} ) = - \frac{1}{2} - \frac{3}{8} = \frac{ - 4 - 3}{8} = - \frac{7}{8} [/tex]
[tex] - \frac{1}{5} - ( - \frac{7}{10} ) = - \frac{1}{5} + \frac{7}{10} = \frac{ - 2 + 7}{10} = \frac{5}{10} = \frac{1}{2} [/tex]
