Resposta:
[tex] \frac{2}{3} + \frac{5}{6} - \frac{1}{2} [/tex]
[tex] = \frac{4}{6} + \frac{5}{6} - \frac{3}{6} [/tex]
[tex] = \frac{6}{6} [/tex]
[tex] = 1[/tex]
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