矩阵题目求解,需要过程,谢谢!

2025-05-09 11:39:18
推荐回答(3个)
回答1:

0 0 1 0
0 2 0 0 r1 <->r2
0 0 0 3 r3 <-> r4
4 0 0 0

=
0 2 0 0
0 0 1 0 r1<->r3
4 0 0 0
0 0 0 3

=-
4 0 0 0
0 0 1 0
0 2 0 0 r2<->r3
0 0 0 3

=
4 0 0 0
0 2 0 0
0 0 1 0
0 0 0 3

=4x2x1x3=24

回答2:

原式=4×(-1)^(4+1)×1×(-1)^(1+3)×2×(-1)^(2+2)×3×(-1)^(3+4)
=-4×1×2×(-3)
=24

回答3:

4