Ответ: Решения в ответе ниже.
а) \[-3.8 \cdot 1.5 = -5.7\]
б) \[-433.62 : (-5.4) = 80.3\]
в) \[-1 \frac{1}{14} \cdot 2 \frac{1}{3} = - \frac{15}{14} \cdot \frac{7}{3} = - \frac{5}{2} = -2.5\]
г) \[1 \frac{1}{7} : (-2 \frac{2}{7}) = \frac{8}{7} : (-\frac{16}{7}) = \frac{8}{7} \cdot (-\frac{7}{16}) = - \frac{1}{2} = -0.5\]
а) \[1.8y = -3.69\]
\[y = -3.69 : 1.8\]
\[y = -2.05\]
б) \[-4.6 : x = -23\]
\[x = -4.6 : (-23)\]
\[x = 0.2\]
в) \[\frac{11}{15}y + \frac{9}{10} = \frac{8}{15}\]
\[\frac{11}{15}y = \frac{8}{15} - \frac{9}{10}\]
\[\frac{11}{15}y = \frac{16}{30} - \frac{27}{30}\]
\[\frac{11}{15}y = -\frac{11}{30}\]
\[y = -\frac{11}{30} : \frac{11}{15}\]
\[y = -\frac{11}{30} \cdot \frac{15}{11}\]
\[y = -\frac{1}{2} = -0.5\]
\[(-3.9 \cdot 2.8 + 26.6) : (-3.2) - 2.1 = (-10.92 + 26.6) : (-3.2) - 2.1 = 15.68 : (-3.2) - 2.1 = -4.9 - 2.1 = -7\]
\[(0.2 - \frac{7}{15}) \cdot (-\frac{5}{8}) - (-\frac{5}{12} - 0.75) : 2 \frac{1}{3} = (\frac{3}{15} - \frac{7}{15}) \cdot (-\frac{5}{8}) - (-\frac{5}{12} - \frac{9}{12}) : \frac{7}{3} = (-\frac{4}{15}) \cdot (-\frac{5}{8}) - (-\frac{14}{12}) : \frac{7}{3} = \frac{1}{6} - (-\frac{7}{6}) \cdot \frac{3}{7} = \frac{1}{6} + \frac{1}{2} = \frac{1}{6} + \frac{3}{6} = \frac{4}{6} = \frac{2}{3}\]
Ответ: Решения в ответе ниже.