4xy^2-4x^2y-y^3
=-y(y^2-4xy+4x^2)
=-y(y-2x)^2
-a+2a^2-a^3
=-a(a^2-2a+1)
=-a(a-1)^2
4xy^2-4x^2y-y^3 和 -a+2a^2-a^3 公因式
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