分数（fraction）是用分式（分数式）表达成a/b个数（a,bin Z,b neq 0）。拉式子中，b 称为分母（Denominator）而a 称为分子（Numerator）。分数像自然数一样，跟从互联律、结合律、分配律搭反除以零个规则。
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