练习2 clear close a a[2900;0414;7551;7874] hlsa=det(a) zhi=rank(a d=inv(a) t-trace(a) c=cond( a练习2 • clc • clear • close all • a=[ 2 9 0 0;0 4 1 4;7 5 5 1;7 8 7 4 ] • hlsa=det(a) • zhia=rank(a) • d=inv(a) • t=trace(a) • c=cond(a)