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偶函數,所以f(x)=f(-x) 當x<0時,-x>0 f(-x)=x^2-3x-1=f(x) 所以解析式 x^2+3x-1 x>0 f(x)= 0 x=0 (偶函數f(0)=0,因為f(0)=f(-0)=-f(0)) x^2-3x-1 x<0
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