你会使用MATLAB吗?这个用迭代方法或用MATLAB求b=solve('(-4/9)*x^4-(8/3)*x^3-18*x^2-72*x-76=0')b =-1.5597621270378537725262282416841-3.59144595746828426736540855644895.508700655157294017034975207302863534...