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∵直線l的方程為(m²;-2m-3)x-(2m^2+m-1)y=2m-6直線l經過定點P(-1,1) ∴-m²;+2m+3-2m²;-m+1=2m-6∴3m²;+m-10=0 ∴(m+2)(3m-5)=0∴m=-2或m=5/3
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