9. Выполните вычитание: в) 4\frac{1}{5}-5\frac{2}{7} *) -5\frac{3}{28}+4\frac{5}{12}

в) \(4\frac{1}{5}-5\frac{2}{7} = \frac{21}{5} - \frac{37}{7} = \frac{147}{35} - \frac{185}{35} = \frac{-38}{35} = -1\frac{3}{35}\) *) \(-5\frac{3}{28}+4\frac{5}{12} = -5\frac{9}{84}+4\frac{35}{84} = -1 + \frac{26}{84} = -\frac{58}{84} = -\frac{29}{42}\)