令f(z)=1/z^2=z^(-2),则f'(z)=-2z^(-3),f"(z)=3!z^(-4),f'''(z)=-4!z^(-5),由此可知f(z)的n阶导数=(-1)^n(n+1)!z^[-(n+2)],所以f(z)在z=1处的泰勒展开式fn(z)=f(1)+∑{(-1)^n(n+1)!1^[-(n+2)]/n!}(z-1)^n+O((z-1)^n),(其中∑下限为1,上限为n),化简即为fn(z)=1+∑(-1)^n(n+1)(z-1)^n+O((z-1)^n)=1-2(z-1)+3(z-1)^2-4(z-1)^3+……+(-1)^n(n+1)(z-1)^n+O((z-1)^n).