Question

Calculati si explicati in baza asociativitatii inmultirii 30×60 12×400 3000×15 60×40 700×10 300×15000

Answer 1

Model: 4×200 = 4×(2×100) = (4×2)×100 = 8×100 = 800

30×60 = 30×(6×10) = (30×6)×10 = 180×10 = 1800

60×40 = 60×(4×10) = (60×4)×10 = 240×10 = 2400

12×400 = 12×(4×100) = (12×4)×100 = 48×100 = 4800

700×110 = 700×(11×10) = (700×11)×10 = 7700×10 = 77000

3000×15 = 3000×(3×5) = (3000×3)×5 = 9000×5 = 45000

300×15000 = 300×(15×1000) = (300×15)×1000 = 4500×1000 = 4500000