用三阶Adams内插法及外插法分别解初值问题u'=-5u,u(0)=1。答:Adams内插法 function [X,Y]=Adams4nei(fun,x0,b,y0,h)x=x0;y=y0;p=128;n=fix((b-x0)/h);if n<5 return end X=zeros(p,1);Y=zeros(p,length(y));f=zeros(p,1);k=1;X(k)=x;Y(k,:)=y';RK4求初值 for k=2:4 b2=1/2;b3=1/2;b4=1;x1=x+1/2*h;x2=...