1、f(x+1)=(x+1)²颤明-(x+1)=x²粗团+2x+1-x-1=x²+x2、f(x+1)=x²-x=(x+1)²-3(x+1)+2因此f(x)=x²-3x+23、f(x-1/x)=x²+1/岩洞橘x²=(x-1/x)²+2f(3)=3²+2=9+2=11
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