Explicación paso a paso:
A.
[tex]( +\frac{3}{5} ) - ( + \frac{10}{5} ) + ( + \frac{9}{5} ) - ( - \frac{3}{5} ) = \frac{3}{5} - \frac{10}{5} + \frac{9}{5} + \frac{3}{5} = \frac{3 - 10 + 9 + 3}{5} = \frac{13}{5} [/tex]
B.
[tex]( \frac{6}{7}) - ( \frac{11}{14} )+ ( - \frac{9}{14} ) - ( - \frac{4}{7} ) = \frac{6}{7} - \frac{11}{14} - \frac{9}{14} + \frac{4}{7} = \frac{6}{7} - \frac{11 - 9}{14} - \frac{4}{7} = \frac{2}{14} = \frac{6}{7} - \frac{1}{7} + \frac{4}{7} = \frac{6 - 1 + 4}{7} = \frac{9}{7} [/tex]
C.
[tex]( - \frac{3}{5} ) - ( + \frac{2}{3} ) - ( + \frac{2}{9} ) - ( - \frac{7}{15} ) = - \frac{3}{5} - \frac{2}{3} - \frac{2}{9} + \frac{7}{15} = - \frac{3 \times 3}{5 \times 2} - \frac{2}{9} + \frac{7}{15} = - \frac{9}{10} - \frac{2 \times 15}{9 \times 7} = - \frac{9}{10} - \frac{30}{46} = \frac{15}{23} = \frac{9 \times 46}{10 \times 30} = \frac{414}{300} = \frac{207}{150} = \frac{69}{75} = \frac{33}{15} = \frac{11}{5} [/tex]
