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分之-﹙x-y﹚³=-﹙x-y﹚²
x²-9分之9-6x+x²=(x+3)(x-3)分之x²-6x+9=(x+3)(x-3)分之(x-3)²
=(x+3)分之(x-3)

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