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判別式=[-(2k-1)]²;-4k²; =4k²;-4k+1-4k²; =-4k+1 所以-4k+11/4無解 -4k+1=0,k=1/4 則x²;/4+x/2+1/4=0 (x/2+1/2)²; x=-1 -4k+1>0,k
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