化简分式.x-y分之﹙y-x﹚³=______.x²-9分之9-6x+x²=_____.

问题描述:

化简分式.x-y分之﹙y-x﹚³=______.x²-9分之9-6x+x²=_____.

x-y分之﹙y-x﹚³=_-(x-y)²_____.
x²-9分之9-6x+x²=___(x-3)/(x+3)__.