计算.x²-y²分之x×-x²分之﹙x-y﹚².x+1分之x-1×1-x分之1+x.
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计算.x²-y²分之x×-x²分之﹙x-y﹚².x+1分之x-1×1-x分之1+x.
计算.x²-y²分之x×-x²分之﹙x-y﹚².x+1分之x-1×1-x分之1+x.
计算.x²-y²分之x×-x²分之﹙x-y﹚².x+1分之x-1×1-x分之1+x.
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
x/(x²-y²)*﹙x-y﹚²/(-x²)-(x-1)/(x+1)*1/(1-x)+x
=(x-1)/(x(x+1)+1/(x+1)+x
=(x-1+x+x3+x2)/(x(x+1)