12ab^2(y-x)+9b^3(x-y)+4a^2b(x-y)
1个回答
原式=-12ab^2(x-y)+9b^3(x-y)+4a^2b(x-y)
=(x-y)b(-12ab+9b^2+4a^2)
=b(x-y)(2a-3b)^2
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