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因為方程有2個不相等的實數根 所以b²;-4ac>0 (-2√k)²;-4×(1-2k)×(-1)>0 4k+4-8k>0 -4k>-4 k<1 且1-2k≠0 k≠1/2 k的取值範圍為k<1且k≠1/2
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