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y^2=12x y=3x+m那麼(3x+m)²;=12x9x²;+6mx+m²;-12x=09x²;+6*(m-2)*x+m²;=0方程組有兩個相同的實數解即上式的判別式等於0,所以【6*(m-2)】²;-4*9*m²;=036*(m-2)²;-36m²;…
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