Решение:
- \( -1.56 - 1.24 = -2.8 \)
- \( 4 - \frac{3}{9} = 4 - \frac{1}{3} = \frac{12}{3} - \frac{1}{3} = \frac{11}{3} \)
- \( -1 - \frac{8}{27} = -\frac{27}{27} - \frac{8}{27} = -\frac{35}{27} \)
- \( \frac{11}{3} : \left(-\frac{35}{27}\right) = \frac{11}{3} \cdot \left(-\frac{27}{35}\right) = -\frac{11 \cdot 9}{35} = -\frac{99}{35} = -2\frac{29}{35} \)
Ответ: 1) -2,8; 2) -229/35.