a) [tex]\frac{3}{5} + \frac{1}{2} - 1 = \frac{6}{10} + \frac{5}{10} - 1 = \frac{10}{10}[/tex]
b) [tex]- \frac{2}{3} + \frac{5}{4} + \frac{1}{2} = - \frac{8}{12} + \frac{15}{12} + \frac{6}{12} = - \frac{1}{12}[/tex]
c) [tex]- \frac{3}{7} + \frac{2}{5} =- \frac{15}{35} + \frac{14}{35} = \frac{1}{35}[/tex]
d) [tex]- 2 - \frac{1}{2} + \frac{2}{3} =- 2 - \frac{3}{6} + \frac{4}{6} = \frac{9}{6}[/tex]
e) [tex]- \frac{1}{2} - \frac{2}{5} + \frac{1}{5} = - \frac{5}{10} - \frac{2}{10} + \frac{2}{10} = \frac{9}{10}[/tex]
f) [tex]\frac{5}{7} - \frac{2}{3} + 1 = \frac{15}{21} - \frac{14}{21} + 1 = \frac{2}{21}[/tex]
g) [tex]- \frac{2}{5} + \frac{1}{2} - \frac{1}{4} = - \frac{8}{20} + \frac{10}{20} - \frac{5}{20} =-\frac{7}{20}[/tex]
h) [tex]- \frac{7}{8} + \frac{3}{4} +\frac{1}{2} = - \frac{7}{8} + \frac{6}{8} + \frac{4}{8} =-\frac{3}{8}[/tex]
i) [tex]- 1 - \frac{3}{5} + \frac{1}{6} = - 1 - \frac{18}{30} + \frac{5}{30} = \frac{24}{30}[/tex]
j) [tex]- 3 - \frac{4}{5} + \frac{1}{2} = - 3 - \frac{8}{10} + \frac{5}{10} = \frac{16}{10}[/tex]
espero ter ajudado!!!!
se puder colocar como melhor resposta agradeceria muito!!!!
