1. Efectuează:
a) 503 - 127-205-189-64;
21 189 + 16 347 -20 508;
b) 185 × 25 × 36: 15-20
895 : 5× 36:9× 29.
c) 26 + 360 : (3 x 50 x 5: 750);
105 - 2× [11+5× 3-(4+8):
d) [1609:3+72:3) 3 - 75×]×2
3× [90: 45.2× 165: 13.10.2003​