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令t=x-1/x, 由於x≠0,所以t∈R, 且由t^2=(x-1/x)^2=x^2+1/x^2-2得x^2+1/x^2=t^2+2, 所以f(t)=t^2+2, 囙此,函數f(x)運算式為f(x)=x^2+2(x∈R).
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