因为e^(3x-3)=1+(3x-3)+(1/2!)(3x-3)^2+(1/3!)(3x-3)^3+...+(1/n!)(3x-3)^n+...
=1+3(x-1)+(3^2/2!)(x-1)^2+(3^3/3!)(x-1)^3+...+(3^n/n!)(x-1)^n+...(-∞