计算.x²－y²分之x×－x²分之﹙x－y﹚².x - 知识问答

计算.x²－y²分之x×－x²分之﹙x－y﹚².x＋1分之x－1×1－x分之1＋

2个回答

x²－y²分之x×－x²分之﹙x－y﹚².
=x/(x+y)(x-y)×(x-y)²/(-x²)
=-(x-y)/x(x+y)
x＋1分之x－1×1－x分之1＋x.
=(x-1)/(x+1)×(x+1)/[-(x-1)]
=-1

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