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2つのルートがあり、0より大きいため だから 判別式△=16+4m≥0 m≥4 x1*x2=-m>1はm<1 x1>1x2>1 したがってx1-1>0x2-1>0 (x1-1)(x2-1)>0 x1*x2-(x1+x2)+1>0 -m-4+1>0 m
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