A =
[tex] \frac{7}{3} - \frac{2}{15} = \frac{7 \times 5}{3 \times 5} - \frac{2}{15} = \frac{35}{15} - \frac{2}{15} = \frac{33}{15} = \frac{11}{5} [/tex]
B =
[tex] \frac{ - 3}{20} + \frac{3}{10} = \frac{ - 3}{20} + \frac{2 \times 2}{10 \times 2} = \frac{ - 3}{20} + \frac{4}{20} = \frac{1}{20} [/tex]
C =
[tex] \frac{11}{24} - \frac{17}{30} = \frac{11 \times 30}{24 \times 30} - \frac{17 \times 24}{30 \times 24} = \frac{330}{720} - \frac{408}{720} = \frac{ - 78}{720} = \frac{ - 13}{120} [/tex]
D =
[tex] \frac{5}{8} + \frac{ - 13}{6} = \frac{5 \times 6}{8 \times 6} + \frac{ - 13 \times 8}{6 \times 8} = \frac{30}{48} + \frac{ - 104}{48} = \frac{ - 74}{48} = \frac{ - 37}{24} [/tex]
