已知m^2-5m-1=0,则2m^2-5m+1/2m^2

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2m^2-5m+1/2m^2 =(m^2+m^2-5m-1)/2m^2=m^2/2m^2=1/2
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再答： (2m^2-5m+1)/2m^2 =(m^2+m^2-5m-1)/2m^2 因为 m^2-5m-1=0 所以 (m^2+m^2-5m-1)/2m^2 =(m^2+0)/2m^2 =m^2/2m^2 =0

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