分别用雅可比、高斯塞达尔、超松弛法解方程组。精度：0.001 。 5*x1 + 2*x2+ x*3=-12 -x1 + x*2+ 2*x3= 20 2*x1 -*3x2 +10*x3= 31: 雅可比迭代法（雅可比迭代法（Jacobi）：）： /* 5*x1 + 2*x2+ x*3=-12 -x1 + x*2+ 2*x3= 20 2*x1 -*3x2 +10*x3= 3 */#include “math.h“#include “stdio.h“main()double a33=5.0,2.0,1.0,-1.0,4.0,2.0,2.0,-3.0,10.0;double x3=0.0,0.0,0.0,y3,b3=-12.0,20.0,3.0;double eps=0.001,e,q,t,s;int i,j,k,N=0;e=eps+1.0;while (e=eps) N+; e=0.0; for(k=0;ke)e=q; printf(“n“);2: 高斯赛德尔迭代法（高斯赛德尔迭代法（G-S）/* 5*x1 + 2*x2+ x*3=-12 -x1 + x*2+ 2*x3= 20 2*x1 -*3x2 +10*x3= 3 */#include “math.h“#include “stdio.h“main()double a33=5.0,2.0,1.0,-1.0,4.0,2.0,2.0,-3.0,10.0;double x3=0.0,0.0,0.0,b3=-12.0,20.0,3.0;double eps=0.001,e,q,t,s;int i,j,k,N=0;e=eps+1.0;while (e=eps) N+; e=0.0;for (i=0; ie)e=q; printf(“n“);3: 逐次超松弛迭代法（逐次超松弛迭代法（SOR）：）：/* 5*x1 + 2*x2+ x*3=-12 -x1 + x*2+ 2*x3= 20 2*x1 -*3x2 +10*x3= 3 */#include “math.h“#include “stdio.h“main()double a33=5.0,2.0,1.0,-1.0,4.0,2.0,2.0,-3.0,10.0;double x3=0.0,0.0,0.0,b3=-12.0,20.0,3.0;double eps=0.001,e,q,t,s;double w=1.15;int i,j,k,N=0;printf(“w=%fn“,w);e=eps+1.0;while (e=eps) N+; e=0.0;for (i=0; ie)e=q; printf(“n“);