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2. (2864 : 4) × 8
= 716 × 8
= 5728
3.-2184 + 580 = -1604
4. 225 × (-40) = -9000
5. 990 - (-300) = 1293

3. - 2.154 + ( 145 × 4)=
-2.154 + 580 = - 1574..

4. 225 × ( -8 ) : 5=
( 225 × (-8) ) : 5=
- 1800 : 5= - 300

5. 6 × 165 - (7.200 : ( - 24) )=
990 + 300 = 1.290