4-r3, r3-r2, r2-(1/2)r1
4 2 2 2
0 1 2 3
0 1 3 6
0 1 4 10
r4-r3, r3-r2
4 2 2 2
0 1 2 3
0 0 1 3
0 0 1 4
r4-r3
4 2 2 2
0 1 2 3
0 0 1 3
0 0 0 1
行列式 = 4
4-r3, r3-r2, r2-(1/2)r1
4 2 2 2
0 1 2 3
0 1 3 6
0 1 4 10
r4-r3, r3-r2
4 2 2 2
0 1 2 3
0 0 1 3
0 0 1 4
r4-r3
4 2 2 2
0 1 2 3
0 0 1 3
0 0 0 1
行列式 = 4