分式$\frac{4xy^{2}}{20x^{2}y}$中分子、分母的公因式为________.---**Question Stem:** 分式 $\frac{4xy^2}{20x^2y}$ 中分子、分母的公因式为_______. **Mathematical Expression:** Fraction: $\frac{4xy^2}{20x^2y}$ Numerator: $4xy^2$ Denominator: $20x^2y$ **Other Relevant Text:** The question asks for the common factor of the numerator and denominator.

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