- $$|-4|+|-23| = 4 + 23 = 27$$
- $$|-21|-|-21| = 21 - 21 = 0$$
- $$|14| : |-15| + 2 = 14 : 15 + 2 = \frac{14}{15} + 2 = \frac{14+30}{15} = \frac{44}{15} = 2\frac{14}{15}$$
- $$|-25|+|-12| \cdot |-5| = 25 + 12 \cdot 5 = 25 + 60 = 85$$
Ответ: 27; 0; $$2\frac{14}{15}$$; 85.