Question

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Answer 1

$\frac{8}{25} - \frac{4}{5} = \frac{8 - 4 \times 5}{25} = - \frac{12}{25}$
$- \frac{2}{7} - \frac{17}{42} = - \frac{2 \times 6 + 17}{42} = - \frac{29}{42}$
$\frac{3}{10} - \frac{8}{15} = \\ = \frac{3 \times 3 - 8 \times 2}{30} = \\ = \frac{9 - 16}{30} = - \frac{7}{30}$
$- \frac{19}{30} + \frac{14}{45} = \\ = \frac{ - 19 \times 3 + 14 \times 2}{90} = \\ = \frac{ - 57 + 28}{90} = - \frac{29}{90}$