你是要过程吧.
r1+4r2,r3-2r2,r4+3r2
-10 0 19 13
-3 1 4 2
13 0 -3 -1
-5 0 10 12
按第2列展开 D =(-1)^(2+2)*
-10 19 13
13 -3 -1
-5 10 12
c1+13c3,c2-3c3
159 -20 13
0 0 -1
151 -26 12
按第2行展开 D = -1*(-1)^(2+3) *
159 -20
151 -26
r1-r2
8 6
151 -26
= 8*(-26) - 6*151
= -1114.
r1+4r2,r3-2r2,r4+3r2
-10 0 19 13
-3 1 4 2
13 0 -3 -1
-5 0 10 12
按第2列展开 D =(-1)^(2+2)*
-10 19 13
13 -3 -1
-5 10 12
c1+13c3,c2-3c3
159 -20 13
0 0 -1
151 -26 12
按第2行展开 D = -1*(-1)^(2+3) *
159 -20
151 -26
r1-r2
8 6
151 -26
= 8*(-26) - 6*151
= -1114.
-1114