原式=
→r2-3r1
1 2 3 4
0 0 3 -7
0 1 3 5
0 4 7 9
=
0 3 -7
1 3 5
4 7 9
=
→r3-4r2
0 3 -7
1 3 5
0 -5 -11
=
-1×(-33-35)
=68
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原式=
→r2-3r1
1 2 3 4
0 0 3 -7
0 1 3 5
0 4 7 9
=
0 3 -7
1 3 5
4 7 9
=
→r3-4r2
0 3 -7
1 3 5
0 -5 -11
=
-1×(-33-35)
=68
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