Explicație pas cu pas:
a)
[tex] \frac{1}{2} + \frac{1}{2} = \frac{1 + 1}{2} = \frac{2}{2} = 1[/tex]
[tex] \frac{1}{2} + \frac{1}{2} = \frac{2}{4} fals[/tex]
b)
[tex] \frac{2}{5} + \frac{1}{5} = \frac{2 + 1}{5} = \frac{3}{5} adevarat[/tex]
c)
[tex] \frac{7}{11} - \frac{2}{11} = \frac{7 - 2}{11} = \frac{5}{11} adevarat[/tex]
d)
[tex] \frac{5}{3} + \frac{2}{3} = \frac{5 + 2}{3} = \frac{7}{3} [/tex]
[tex] \frac{5}{3} - \frac{2}{3} = \frac{5 - 2}{3} = \frac{3}{3} = 1[/tex]
[tex] \frac{7}{3} nu \: este \: = 1 \\ rezulta \\ \frac{5}{3} + \frac{2}{3} = \frac{5}{3} - \frac{2}{3} fals[/tex]
