Find the rule of vacuum, 21 * 24 = 12 * 42, 63 * 12 = 36 * 21, 12 * 84 = 21 * 48. According to these rules, we deduce and list them Which law equation is the law

21*24＝12*42,63*12=36*21,12*84=21*48,
Regular equation: X * y = (1 / a) x * (a) y (a > 1)

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