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y=x^24x-y-5=0 y=4x-5y=4x+mx^2=4x+m x^2-4x-m=0(x-2)^2-4-m=0(x-2)^2=4+m m=-4時x有唯一x=2得:p(2,4),點P的切線方程y=4x-4要點:曲線與直線相切時,曲線與直線僅有一個交點!要點:平面內相互平行的直線,其斜…
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