Выполните действия: 1) -2,1 * 3,8; 2) -1 11/13 * (-2 7/16); 3) -14,16 : (-0,6); 4) -18,36 : 18.

1) $$-2.1 \cdot 3.8 = -7.98$$ 2) $$-1\frac{11}{13} \cdot (-2\frac{7}{16}) = -\frac{24}{13} \cdot (-\frac{39}{16}) = \frac{24 \cdot 39}{13 \cdot 16} = \frac{3 \cdot 3}{1 \cdot 2} = \frac{9}{2} = 4.5$$ 3) $$-14.16 : (-0.6) = 14.16 : 0.6 = 23.6$$ 4) $$-18.36 : 18 = -1.02$$