ГДЗ Математика 6 клас Істер — Вправа 1056

1) $-4,254 + 6,44 = 6,44 - 4,254 = 2,186;$
2) $-6,7 + 5,9 = -(6,7 - 5,9) = -0,8;$
3) $-4,8 + 4,8 = 0;$
4) $0,8957 + (-1) = -(1 - 0,8957) = -0,1043;$
5) $\frac{5}{12} + \left(-\frac{7}{9}\right) = \frac{15}{36} - \frac{28}{36} = -\frac{13}{36};$
6) $-\frac{11}{42} + \frac{5}{28} = -\frac{22}{84} + \frac{15}{84} = -\frac{7}{84} = -\frac{1}{12};$
7) $1 + \left(-\frac{11}{38}\right) = \frac{38}{38} - \frac{11}{38} = \frac{27}{38};$
8) $\frac{7}{10} + \left(-\frac{9}{14}\right) = \frac{49}{70} - \frac{45}{70} = \frac{4}{70} = \frac{2}{35};$
9) $-\frac{4}{25} + \frac{7}{15} = -\frac{12}{75} + \frac{35}{75} = \frac{23}{75}.$