=a^m(a²-1）
=a^m(a+1)(a-1)a²(x-y)^3+9b²(y-x)^3a²-1+b²-2aba²(x-y)^3+9b²(y-x)^3=a²(x-y)³-9b²(x-y)³=(x-y)³(a²-9b²)=(x-y)³(a+3b)(a-3b)a²-1+b²-2ab=(a²-2ab+b²)-1=(a-b)²-1=(a-b+1)(a-b-1) 请采纳