计算下列行列式,尽量写出思考的过程~

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计算下列行列式,尽量写出思考的过程~
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计算下列行列式,尽量写出思考的过程~
计算下列行列式,尽量写出思考的过程~

计算下列行列式,尽量写出思考的过程~
r3-2r1-2r2,r1-4r2
0 -7 2 -4
1 2 0 2
0 -1 -2 -12
0 1 1 7
r1r2
1 2 0 2
0 -7 2 -4
0 -1 -2 -12
0 1 1 7
r2-7r3,r4+r3
1 2 0 2
0 0 16 80
0 -1 -2 -12
0 0 -1 -5
r2+16r4
1 2 0 2
0 0 0 0
0 -1 -2 -12
0 0 -1 -5
行列式 = 0

4 -1 2 -10
1 2 0 2
10 3 2 -14
0 0 1 0
=-
4 -1 -10
1 2 2
10 3 -14
=-
0 -9 -18
1 2 2
0 -17 -34
=+
-9 -18
-17 -34
=-9(-17)
1 2
1 2
=0