解几个因式分解题吧1.2x²-4x 2.8m²n+2mn 3.a²x²y-axy² 4.3x³-3x²-9x 5.-24x²-12xy²+28y³ 6.-4a³b³+6a²b-2ab 7.-2x²-12xy²+8xy³ 8.-3ma³+6ma²-12ma

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