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令F(x)=f(x)+g(x)f(x)是奇函數,g(x)是偶函數F(x)=x+1/(2+x)=f(x)+g(x)F(-x)=-x+1/(2-x)=f(-x)+g(-x)=-f(x)+g(x)f(x)=[F(x)-F(-x)]/2=x+x/(x^2-4)g(x)=[F(x)+F(-x)]/2=-2/(x^2-4)
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