Question

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Answer 1

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