Explicación paso a paso:
(2×4)×5=2×(4×5)
8×5=2×20
40=40
(3×2)×9=3×(2×9)
6×9=3×18
54=54
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Explicación paso a paso:
(2×4)×5=2×(4×5)
8×5=2×20
40=40
(3×2)×9=3×(2×9)
6×9=3×18
54=54