Some formulas are interesting. For example: 5*2=5/(1/2), 6*3=6/(1/3), 8*3=8/(1/3)..., m*a=m/(1/(a )) (m, a are both natural numbers greater than 0). This shows how many rules.
有些算式很有意思．比如：5*2=5/(1/2)，6*3=6/(1/3)，8*3=8/(1/3)…，m*a=m/(1/(a))(m、a均为大于0的自然数)．这说明了多少的规律．
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