错误：gn(x)=A∗gn(x−1)+B(n≠0)g^n(x)=A*g^n(x-1)+B(n\neq 0)gn(x)=A∗gn(x−1)+B(n=0) 正确：gn(x)=A∗gn−1(x)+B(n≠0)g^n(x)=A*g^{n-1}(x)+B(n\neq 0)gn(x)=A∗gn−1(x)+B(n=0)
