(x+1)分之1+(1-x)分之1怎么算? 40
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1/(x+1)+1/(1-x)
=1/(x+1)+1/[-(x-1)]
=1/(x+1)-1/(x-1)
=(x-1)/(x+1)(x-1)-(x+1)/(x-1)(x+1)
=[(x-1)-(x+1)]/(x+1)(x-1)
=-2/(x^2-1)
=1/(x+1)+1/[-(x-1)]
=1/(x+1)-1/(x-1)
=(x-1)/(x+1)(x-1)-(x+1)/(x-1)(x+1)
=[(x-1)-(x+1)]/(x+1)(x-1)
=-2/(x^2-1)
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1/(x+1)+1/(1-x)
=[(1-x)+(1+x)]/[(1+x)(1-x)]
=2/(1-x^2)
=[(1-x)+(1+x)]/[(1+x)(1-x)]
=2/(1-x^2)
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1/(x+1) +1/(1-x)
=1/(x+1)-1/(x-1)
=(x-1-x-1)/(x+1)(x-1)
=-2/(x²-1)
=1/(x+1)-1/(x-1)
=(x-1-x-1)/(x+1)(x-1)
=-2/(x²-1)
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