a/b × c/d = (a × c)/(d × d)分子相乘作积的分子,分母相乘作积的分母.
a/b ÷ c/d = (a ÷ c) / (b ÷ d)被除数的分子除以除数的分子作为商的分子,被除数的分母除以除数的分母作商的分母.
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