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因為f(1+x)=-f(1-x) 令x=0 f(1)=-f(1)即f(1)=0 所以f(1)=(1+a)^3=0所以a=-1 有f(x)=(x-1)^3 f(2)+f(-2)=(2-1)^3+(-2-1)^3=1+(-27)=-26
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