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 (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 (x+y)x方-y方分之x方+y-x分之y方
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

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
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