1) Calcular a) (2)/(7)+(10)/(7)= b) 4(5)/(9)-(3)/(9)= c) 5(1)/(2)+(2)/(3)= d) (5)/(3)-(3)/(4)=

Vamos calcular cada uma das expressões:<br /><br />a) \(\frac{2}{7} + \frac{10}{7} = \frac{2 + 10}{7} = \frac{12}{7}\)<br /><br />b) \(4\frac{5}{9} - \frac{3}{9} = 4\frac{5 - 3}{9} = 4\frac{2}{9}\)<br /><br />c) \(5\frac{1}{2} + \frac{2}{3} = 5\frac{3}{6} + \frac{4}{6} = 5\frac{7}{6} = 6\frac{1}{6}\)<br /><br />d) \(\frac{5}{3} - \frac{3}{4} = \frac{20}{12} - \frac{9}{12} = \frac{11}{12}\)<br /><br />Portanto, as respostas são:<br /><br />a) \(\frac{12}{7}\)<br /><br />b) \(4\frac{2}{9}\)<br /><br />c) \(6\frac{1}{6}\)<br /><br />d) \(\frac{11}{12}\)