计算 x-2分之x方+1-2-x分之3-4x （x+y）x方-y方分之x方+y-x分之y方
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计算 x-2分之x方+1-2-x分之3-4x
=(x²+1)/(x-2)-(4x-3)/(x-2)
=(x²+1-4x+3)/(x-2)
=(x-2)²/(x-2)
=x-2
（x+y）x方-y方分之x方+y-x分之y方
=(x+y)×x²/(x+y)(x-y)-y²/(x-y)
=x²/(x-y)-y²/(x-y)
=(x²-y²)/(x-y)
=x+y
=(x²+1)/(x-2)-(4x-3)/(x-2)
=(x²+1-4x+3)/(x-2)
=(x-2)²/(x-2)
=x-2
（x+y）x方-y方分之x方+y-x分之y方
=(x+y)×x²/(x+y)(x-y)-y²/(x-y)
=x²/(x-y)-y²/(x-y)
=(x²-y²)/(x-y)
=x+y
追问
x方-2xy+y方分之x四次方-x方y方除以y方分之x方+xy乘x方分之y方
a+2分之a-2-a方+4a+a分之a方-a除以a+2分之a-4
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