Trần Thị Kim Ngân 09139107 1.4 >> a=[1 -3 2] a= -3 >> r=roots(a) r= 1.6 >> a=[1 -1 2] a= -1 >> r=roots(a) r= 0.5000 + 1.3229i 0.5000 - 1.3229i 3.5 a >> a=[1 -3 1] a= -3 >> r=roots(a) r= -1.8794 1.5321 0.3473 >> a=[3 -3 -1] a= -3 -1 >> r=roots(a) r= -1.2229 1.0000 0.1114 + 0.5101i 0.1114 - 0.5101i >> A=[zeros(4,6)] A= 0 0 0 0 0 0 0 0 0 0 0 0 >> B=[ones(4,5)] B= 1 1 1 1 1 1 1 1 1 1 >> C=[eye(5,5)] C= 0 0 0 0 0 0 0 0 3.7 b >> A=[1 1 1;1 4;2 9;1 7] A= 1 1 1 >> B=[2;2;2;2] B= 2 2 >> u=A\B u= -2 -6