1/x-1 -1/x+1 -2/x方+1

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1/x-1 -1/x+1 -2/x方+1
1/x-1 -1/x+1 -2/x方+1

1/x-1 -1/x+1 -2/x方+1
1/x-1 -1/x+1 -2/x²+1
=1/x-1 -1/x+1-2/(x+1)(x-1)
=(x+1)-(x-1)-2
=x+1-x+1-2
=0

1/x-1 -1/x+1 -2/x方+1
通分后=4/(x^2-1)(x^2+1)

x+1-x+1-2/（x^2+1）=0