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用分子和分母的公约数同时除分子和分母，使分子、分母都比原来小而分数值不变。如16/64约分成1/4。

1. 数学名词。用分母、分子的最大公因数除分子和分母，使分数化简而数值不变。

reduced fraction (e.g. one half for three sixths); to reduce a fraction by canceling common factors in the numerator and denominator