约分x²-x/x²-1

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约分x²-x/x²-1约分x²-x/x²-1约分x²-x/x²-1x²-x/x²-1x(x-1)/(x+1)(x-1)=

约分x²-x/x²-1
约分x²-x/x²-1

约分x²-x/x²-1
x²-x/x²-1
x(x-1)/(x+1)(x-1)
=x/(x+1)

X/X+1

=x/(x+1)