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已知直線2x-y-5=0的斜率為2, ∴直線L的斜率是-1/2 設P(x0,x0²;) y=x²; ∴y'=2x ∴切線斜率為k=2x0=-1/2 ∴x0=-1/4 ∴切點為(-1/4,1/16) ∴切線方程為y-1/16=-(1/2)(x+1/4) ∴切線方程為8x+16y+1=0
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