a的三次方(3a-2)+(2-3a)b的平方
=a³(3a-2)-b²(3a-2)
=(3a-2)(a³-b²)
a的二次方(3a-2)+(2-3a)b的平方
=a²(3a-2)-b²(3a-2)
=(3a-2)(a²-b²)
=(3a-2)(a+b)(a-b)
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