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y=x³;+ax²;-4/3ay '= 3x²;+2ax = x(3x+2a)= 0x=0,或x=-2a/3將x=0代入y=x³;+ax²;-4/3a=0得:a=0將x=-2a/3代入y=x³;+ax²;-4/3a=0得:-8a³;/27+4a³;/9-4a/3=0-8a³;+12a³…
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