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依題意得:m²;-2m-3=2m²;+m-1 則:m²;+3m+2=0 (m+1)(m+2)=0 m=-1或m=-2 而當m=-1時,m²;-2m-3=2m²;+m-1=1+2-3=0,此時沒有截距,故m=-1舍去 所以m=-2
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