Question

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Answer 1

RESOLUCIÓN:

$* \: a \times b = b \times a \\ 12 \times 9 = 9 \times 12 \\ 108 = 108$

$* \: a \times c \times d = 12 \times 25 \times 0 = 0$

$* \: bce = 9 \times 25 \times 1 = 225$

$* \: c \times b = 25 \times 9 = 225$

$* \: (ab)c = a(bc) \\ (12 \times 9) \times 25 = 12 \times (9 \times 25) \\ 108 \times 25 = 12 \times 225 \\ 2700 = 2700$

$* \: abc = 12 \times 9 \times 25 = 2700$