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設x0,所以可以把-x代入已知的函數式,f(-x)=(-x)^2-2(-x)+3=x^2+2x+3, 因為是奇函數,所以上式的左邊f(-x)=-f(x), f(x)=-x^2-2x-3(注意此式中只適用於x0 0,x=0 -x^2-2x-3,x
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