f(x+1)=x^2+2x+2,求f(x)的解析式设y=x+1x=y-1f(x+1)=x^2+2x+2f(y)=(y-1)^2+2(y-1)+2f（y）=y^2-2y+1+2y-2+2f(y)=y^2+1f(x)=x^2+1 f（y）=y^2-2y+1+2y-2+2怎样的来?

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f(x+1)=x^2+2x+2,求f(x)的解析式设y=x+1x=y-1f(x+1)=x^2+2x+2f(y)=(y-1)^2+2(y-1)+2f（y）=y^2-2y+1+2y-2+2f(y)=y^2+1f(x)=x^2+1 f（y）=y^2-2y+1+2y-2+2怎样的来?
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f(x+1)=x^2+2x+2,求f(x)的解析式设y=x+1x=y-1f(x+1)=x^2+2x+2f(y)=(y-1)^2+2(y-1)+2f（y）=y^2-2y+1+2y-2+2f(y)=y^2+1f(x)=x^2+1 f（y）=y^2-2y+1+2y-2+2怎样的来?
f(x+1)=x^2+2x+2,求f(x)的解析式设y=x+1
x=y-1
f(x+1)=x^2+2x+2
f(y)=(y-1)^2+2(y-1)+2
f（y）=y^2-2y+1+2y-2+2
f(y)=y^2+1
f(x)=x^2+1 f（y）=y^2-2y+1+2y-2+2怎样的来?

f(x+1)=x^2+2x+2,求f(x)的解析式设y=x+1x=y-1f(x+1)=x^2+2x+2f(y)=(y-1)^2+2(y-1)+2f（y）=y^2-2y+1+2y-2+2f(y)=y^2+1f(x)=x^2+1 f（y）=y^2-2y+1+2y-2+2怎样的来?
f(y)=(y-1)^2+2(y-1)+2
=y^2-2y+1+2y-2+2
=y^2+1

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