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由條件f(3+x)=f(3-x),說明二次函數【設為y=ax^2+bx+c】的對稱軸為:x=-b/2a=3,則-b/a=6.而ax^2+bx+c=0的兩個根是x1,x2,由根與係數關係得:x1+x2=-b/a=6.
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