-4a三次方+16a²+12a

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-4a三次方+16a²+12a

=-4a(a²-4a-3)

-4a³+16a²+12a=-4a(a²-4a-3)


-4a³+16a²-12a
=-4a(a²-4a+3)
=-4a(a-1)(a-3)