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關於y對稱,那就是偶函數,那麼f(x)=f(-x) (x-2a)(x+a^2)=(-x-2a)(-x+a^2) x^2+(a^2-2a)x-2a^3=x^2+(2a-a^2)x-2a^3 a^2-2a=2a-a^2 a(a-2)=0 那麼a=0,2
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