Răspuns:
Explicație pas cu pas:
2 × 43 × 5 × 10 = 43 × (2×5×10) = 43 × 100 = 4 300
→ folosesc asociativitatea
6 × 19 × 5 = 19 × (6×5) = 19×30 = 570
2 × 13 × 50 = 13 × (2×50) = 13×100 = 1 300
2 × 8 × 100 × 5 = (8×100) × (2×5) = 800 ×10 = 8 000
12 × 147 × 10 = 147 × (12×10) = 147 ×120 = 17 640
15 × 16 × 2 = 16 × (15×2) = 16×30 = 480
2×25×2×60 = 60 × (2×2×25) = 60 × 100 = 6 000
4 × 68 × 25 × 10 = (68×10) × (4×25) = 680 × 100 = 68 000
