线性代数题,2,设行列式D=【a11,a12,a13;a21,a22,a23;a31,a32,a33】=K,则D1=[a11,a12,1,设行列式D=【a11,a12,a13;a21,a22,a23;a31,a32,a33】=K,则D1=[2a11,2a12,2a13;3a31,3a32,3a33;-a21,-a22,-a23】=?2,设A=[1 2 3;0 3 -2;0 6 t
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线性代数题,2,设行列式D=【a11,a12,a13;a21,a22,a23;a31,a32,a33】=K,则D1=[a11,a12,1,设行列式D=【a11,a12,a13;a21,a22,a23;a31,a32,a33】=K,则D1=[2a11,2a12,2a13;3a31,3a32,3a33;-a21,-a22,-a23】=?2,设A=[1 2 3;0 3 -2;0 6 t
线性代数题,2,设行列式D=【a11,a12,a13;a21,a22,a23;a31,a32,a33】=K,则D1=[a11,a12,
1,设行列式D=【a11,a12,a13;a21,a22,a23;a31,a32,a33】=K,则D1=[2a11,2a12,2a13;3a31,3a32,3a33;-a21,-a22,-a23】=?
2,设A=[1 2 3;0 3 -2;0 6 t】当t=?时,R(A)=2
3已知n维奇次线性方程组有唯一解,则r(A)?n;当r(A)?n时,方程组有无穷多解
线性代数题,2,设行列式D=【a11,a12,a13;a21,a22,a23;a31,a32,a33】=K,则D1=[a11,a12,1,设行列式D=【a11,a12,a13;a21,a22,a23;a31,a32,a33】=K,则D1=[2a11,2a12,2a13;3a31,3a32,3a33;-a21,-a22,-a23】=?2,设A=[1 2 3;0 3 -2;0 6 t
1,设行列式D=【a11,a12,a13;a21,a22,a23;a31,a32,a33】=K,则
D1=[2a11,2a12,2a13;
3a31,3a32,3a33;
-a21,-a22,-a23】
=2×3×(-1)×
[a11,a12,a13;
a31,a32,a33;
a21,a22,a23】
=-6×(-1)×
【a11,a12,a13;a21,a22,a23;a31,a32,a33】
=6k
2,设A=[1 2 3;0 3 -2;0 6 t】当t=?时,R(A)=2
|A|=
|1 2 3
0 3 -2
0 6 t|
=
|3 -2
6 t|
=3t+12=0
t=-4
3已知n维奇次线性方程组有唯一解,则r(A)=n;当r(A)