分解因式4m^3+4m^2n-9mn^2-9n^3 ax^2=ax-bx-b -3x^2-2x^2y^2+6xy (2x^3-4)+(x^2-8x) 4x^2-y^2-4x-2y分解因式(1)4m^3+4m^2n-9mn^2-9n^3 (2) ax^2+ax-bx-b (3)x^3y-3x^2-2x^2y^2+6xy (4)(2x^3-4)+(x^2-8x) (5)4x^2-y^2-4x-2y

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