p1_mrg_matrix4

2892 days ago by LAC2011

#1) a=matrix(3,3,(1,2,3,4,5,6,7,8,-9));a 
       
det(a) 
       
b=matrix(1,3,(26,9,19));b 
       
c=b*a;c 
       
d=c*a**(-1);d 
       
#2) a=matrix(3,3,(2,0,4,0,1,4,1,1,-1));a 
       
b=matrix(3,1,(14,28,0));b 
       
a**(-1)*b 
       
#3) a=matrix(3,3,(1,1,1,.065,.07,.09,0,2,-1));a 
       
b=matrix(3,1,(45000,2925,0));b 
       
n(a**(-1)*b,digits=7)