计算:x/(1-x)-1/(x-3)
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计算:x/(1-x)-1/(x-3)
计算:x/(1-x)-1/(x-3)
计算:x/(1-x)-1/(x-3)
通分:
原式=[X(X-3)-(1-X)]/(1-X)(X-3)
=[X^2-2X-1]/(1-X)(X-3).
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