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令g(x)=f(x)-x=x^3-x^2+x/2+1/4-x=x^3-x^2-x/2+1/4 對於x∈[0,1/2],g(0)=1/4,g(1/2)=1/8-1/4-1/4+1/4=-1/8 g(0)*g(1/2)
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