ex 45 calculer en regroupent astucieusement les facteure
a. 2×12,3×50 b.25×3,7×4 c.12×2,5×5×4 d.500×25×0,4×2
a. 2×12,3×50 b.25×3,7×4 c.12×2,5×5×4 d.500×25×0,4×2
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Explications étape par étape:
a. (2×50)×12,3 = 100×12,3 = 1 230
b. (25×4)×3,7 = 100×3,7 = 370
c. (4×2,5) ×(12×5) = 10 × 60 = 600
d. (500×2)×(25×0,4) = 1000× 10 = 10 000.