第23题怎么做?
2017-12-28 · 知道合伙人教育行家
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[1+x-1/(1-x)]÷[x-x^2/(x-1)]
=[(1+x)(1-x)/(1-x)]÷[x(x-1)-x^2]/(x-1)
=[(1+x)(1-x)/(1-x)]÷(x^2-x-x^2)/(x-1)
=[(1+x)(1-x)/(1-x)]×(x-1)/(-x)
=(1-x^2)/(1-x)×(1-x)/x
=(1-x^2)/x
=[(1+x)(1-x)/(1-x)]÷[x(x-1)-x^2]/(x-1)
=[(1+x)(1-x)/(1-x)]÷(x^2-x-x^2)/(x-1)
=[(1+x)(1-x)/(1-x)]×(x-1)/(-x)
=(1-x^2)/(1-x)×(1-x)/x
=(1-x^2)/x
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