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f(x)+2f(-x)=x^3-2……1 f(-x)+3f(x)=(-x)^3-2=-x^3-2……2 1-2*2,有 f(x)-6f(x)=x^3-1+2x^3+4 -5f(x)=3x^3+3 f(x)=-3x^3/5+3/5
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