计算:(x^2-2x+1-y^2)/(x+y-1)RT

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计算:(x^2-2x+1-y^2)/(x+y-1)RT计算:(x^2-2x+1-y^2)/(x+y-1)RT计算:(x^2-2x+1-y^2)/(x+y-1)RT(x^2-2x+1-y^2)/(x+y

计算:(x^2-2x+1-y^2)/(x+y-1)RT
计算:(x^2-2x+1-y^2)/(x+y-1)
RT

计算:(x^2-2x+1-y^2)/(x+y-1)RT
(x^2-2x+1-y^2)/(x+y-1)
=[(x-1)^2-y^2]/(x+y-1)
=(x+y-1)(x-y-1)/(x+y-1)
=x-y-1

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