3.[单选题]设迭代函数varphi(x)在方程x=varphi(x)的根x*的附近有连续的p阶导数，且varphi^prime(x^*)=0，varphi^primeprime(x^*)neq0，则迭代公式x_(k+1)=varphi(x_(k))(k=0,1,2...)是()阶收敛。A. 1B. 2C. 3D. 4

3.[单选题]设迭代函数$\varphi(x)$在方程x=\varphi(x)的根x*的附近有连续的p阶导数，且$\varphi^{\prime}(x^{*})=0$，$\varphi^{\prime\prime}(x^{*})\neq0$，则迭代公式$x_{k+1}=\varphi(x_{k})(k=0,1,2\cdots)$是()阶收敛。

A. 1

B. 2

C. 3

D. 4