- $$|-8,4| + |3,7| = 8,4 + 3,7 = 12,1$$
- $$|-14| \cdot |-4| = 14 \cdot 4 = 56$$
- $$|\frac{5}{6}| - |-\frac{7}{9}| = \frac{5}{6} - \frac{7}{9} = \frac{5 \cdot 3}{6 \cdot 3} - \frac{7 \cdot 2}{9 \cdot 2} = \frac{15}{18} - \frac{14}{18} = \frac{15-14}{18} = \frac{1}{18}$$
- $$|-63| : |-0,7| = 63 : 0,7 = 630 : 7 = 90$$
Ответ: 1) 12,1; 2) 56; 3) $$\frac{1}{18}$$; 4) 90