x方-2x+1分之x方-1+x-2分之x方-2x

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x方-2x+1分之x方-1+x-2分之x方-2x
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x方-2x+1分之x方-1+x-2分之x方-2x
x方-2x+1分之x方-1+x-2分之x方-2x

x方-2x+1分之x方-1+x-2分之x方-2x
x方-2x+1分之x方-1+x-2分之x方-2x
=(x+1)(x-1)/(x-1)^2+x(x-2)/(x-2)
=(x+1)/(x-1)+x
=x+1+x^2-x/(x-1)
=1+x^2/(x-1)