Respuesta:
3×(6×5) = (3×3)×10
3×30 = 9×10
90 = 90
12×(10×4) = (2×3)×80
12×40 = 6×80
480 = 480
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Respuesta:
3×(6×5) = (3×3)×10
3×30 = 9×10
90 = 90
12×(10×4) = (2×3)×80
12×40 = 6×80
480 = 480