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)
