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55.

$- \frac{3}{5} - \frac{4}{15} = - \frac{9}{15} - \frac{4}{15} = - \frac{13}{15}$

б)

$\frac{1}{8} - \frac{5}{24} = \frac{3}{24} - \frac{5}{24} = - \frac{2}{24} = - \frac{1}{12}$

в)

$- \frac{5}{18} + \frac{1}{6} = - \frac{5}{18} + \frac{3}{18} = - \frac{2}{18} = \\ = - \frac{1}{9}$

Г)

$- \frac{7}{12} - \frac{3}{4} = - \frac{7}{12} - \frac{9}{12} = - \frac{16}{12} = \\ = - 1 \frac{4}{12} = - 1 \frac{1}{3}$

Д)

$\frac{9}{25} - \frac{2}{5} = \frac{9}{25} - \frac{10}{25} = - \frac{1}{25}$

Е)

$- \frac{3}{11} + \frac{10}{33} = - \frac{9}{33} + \frac{10}{33} = \frac{1}{33}$

56.

а)

$- \frac{8}{21} - \frac{5}{7} = - \frac{8}{21} - \frac{15}{21} = - \frac{23}{21} = \\ = - 1 \frac{2}{21}$

б)

$- \frac{16}{27} + \frac{2}{9} = - \frac{16}{27} + \frac{6}{27} = - \frac{10}{27}$

в)

$\frac{7}{19} - \frac{3}{38} = \frac{14}{38} - \frac{3}{38} = \frac{11}{38}$

Г)

$- \frac{5}{48} - \frac{19}{24} = - \frac{5}{48} - \frac{38}{48} = - \frac{43}{48}$

Д)

$- \frac{15}{16} + \frac{13}{32} = - \frac{30}{32} + \frac{13}{32} = - \frac{17}{32}$

Е)

$\frac{1}{45} - \frac{11}{15} = \frac{1}{45} - \frac{33}{45} = \frac{32}{45}$

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