x^2-1/(x-1)^2÷1/x-1`1/x+1怎么做?
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x^2-1/(x-1)^2÷1/x-1`1/x+1怎么做?
秒好评!
秒好评!
原式=(x+1)(x-1)/(x-1)²*(x-1)*1/(x+1)
=(x+1)/(x-1)*(x-1)*1/(x+1)
=(x+1)*1/(x+1)
=1
=(x+1)/(x-1)*(x-1)*1/(x+1)
=(x+1)*1/(x+1)
=1
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