Question

1. Calculează rapid, grupand convenabil factorii. a) 20.42.5=? c) 4.2.15.5.50 = ? b) 4. 28. 150 = ? d) 11.322.5 = ? e) 250 x 25 x 4x2 = ? f) 500 x 12 x 5x2 = ?










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Answer 1

Răspuns:

a) 20 × 42 × 5 = (20×5) × 42= 100 ×42 = 4200

b) 4 × 28 × 150 = (4×150)× 28= 600 × 28= 16800

c) 4 × 2 × 15 × 5 × 50= (2×50) × (5×4) ×15= 100×20×15=30000

d) 11×322×5 = (5×322)×11= 1610×11= 17 710

e) 250×25×4×2= (25×4)×(250×2)=100 × 500= 50000

f) 500×12×5×2= (500×2)×(12×5)= 1000× 60= 60 000