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x/(x²;-x+1)=1/5 1/(x -1 +1/x)=1/5 /分子分母同除以x x -1 +1/x=5 x+ 1/x=6 x²;/(x⁴;+x²;+1) =1/(x²;+1 +1/x²;)/分子分母同除以x²; =1/[(x+1/x)²;-1] /分母配方 =1/(6²;-1) =1/35
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