1.创建一个函数%牛顿法求立方根function x=cube_newton(a)f=@(x)x^3-a;df=diff(sym('x^3-a'));if a==0;x1=a;elsex0=a;x1=x0-f(x0)/subs(df,x0);while abs(x1-x0)>1e-6x0=x1;x1=x0-f(x0)/subs(df,x0);endendx=x1;2.>>...