通分:1/x^2-1,1/x^2-x,1/x^2-2x+1急

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通分:1/x^2-1,1/x^2-x,1/x^2-2x+1急通分:1/x^2-1,1/x^2-x,1/x^2-2x+1急通分:1/x^2-1,1/x^2-x,1/x^2-2x+1急1/x^2-1=1/

通分:1/x^2-1,1/x^2-x,1/x^2-2x+1急
通分:1/x^2-1,1/x^2-x,1/x^2-2x+1

通分:1/x^2-1,1/x^2-x,1/x^2-2x+1急
1/x^2-1
=1/(x-1)(x+1),
=x(x-1)/x(x-1)^2(x+1),
1/x^2-x,
=1/x(x-1)
=(x-1)(x+1)/x(x-1)^2(x+1)
1/x^2-2x+1
=1/(x-1)^2
=x(x+1)/x(x-1)^2(x+1)