约分 (6ab²)/(8b³) (x³-2x²y)/(x²y-2xy²)(6ab²)/(8b³) (x³-2x²y)/(x²y-2xy²) (16b²y²)/(20ay³) (x²+6x+9)/(x²-9) (m³-2m²-m)/(m²-m) (a²+ab)/(a²

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