X2-1分之2x-x-1分之1
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X2-1分之2x-x-1分之1
2x/(x^2-1)-1/(x-1)
=2x/(x-1)(x+1)-(x+1)/(x-1)(x+1)
=[2x-(x+1)]/(x-1)(x+1)
=(2x-x-1)/(x-1)(x+1)
=(x-1)/(x-1)(x+1)
=1/(x+1)(x+1分之1 )
=2x/(x-1)(x+1)-(x+1)/(x-1)(x+1)
=[2x-(x+1)]/(x-1)(x+1)
=(2x-x-1)/(x-1)(x+1)
=(x-1)/(x-1)(x+1)
=1/(x+1)(x+1分之1 )
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