x+1-(x-1分之x方)
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x+1-(x-1分之x方)
x+1-(x-1分之x方)
x+1-(x-1分之x方)
=x+1-x^2/(x-1)
=(x+1)(x-1)/(x-1)-x^2/(x-1)
=(x^2-1-x^2)/(x-1)
=1/1-x
=(x+1)(x-1)/(x-1)-x²/(x-1)
=(x²-1-x²)/(x-1)
=1/(1-x)
(x-1)(x+1)/x-1-x^2/x-1
=-1/x-1=1/1-x
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