Решение номера 210: Сложение чисел с разными знаками

№ 227. Выполните сложение: а) \( 48 + (-67) = -(67 - 48) = -19 \) б) \( -69 + 84 = 84 - 69 = 15 \) в) \( 4,75 + (-2,83) = 4,75 - 2,83 = 1,92 \) г) \( -6,5 + 8,23 = 8,23 - 6,5 = 1,73 \) д) \( -\frac{7}{24} + \frac{5}{18} = -\frac{21}{72} + \frac{20}{72} = -(\frac{21}{72} - \frac{20}{72}) = -\frac{1}{72} \) е) \( \frac{5}{42} + (-\frac{11}{63}) = \frac{15}{126} - \frac{22}{126} = -(\frac{22}{126} - \frac{15}{126}) = -\frac{7}{126} = -\frac{1}{18} \) ж) \( -1 + \frac{4}{9} = -\frac{9}{9} + \frac{4}{9} = -\frac{5}{9} \) з) \( 1\frac{9}{20} + (-1\frac{8}{15}) = 1\frac{27}{60} - 1\frac{32}{60} = -(1\frac{32}{60} - 1\frac{27}{60}) = -\frac{5}{60} = -\frac{1}{12} \)