D=a 0 0 0 1 -a b 0 0 1 -a -b c 0 1 -a -b -c d 1 -a -b -c -d 1

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D=a0001-ab001-a-bc01-a-b-cd1-a-b-c-d1D=a0001-ab001-a-bc01-a-b-cd1-a-b-c-d1D=a0001-ab001-a-bc01-a-b-c

D=a 0 0 0 1 -a b 0 0 1 -a -b c 0 1 -a -b -c d 1 -a -b -c -d 1
D=a 0 0 0 1 -a b 0 0 1 -a -b c 0 1 -a -b -c d 1 -a -b -c -d 1

D=a 0 0 0 1 -a b 0 0 1 -a -b c 0 1 -a -b -c d 1 -a -b -c -d 1
ri+r1,i=2,3,4,5 所有行加第1行
a 0 0 0 1
0 b 0 0 2
0 -b c 0 2
0 -b -c d 2
0 -b -c -d 2
r3+r2,r4+r2,r5+r2
a 0 0 0 1
0 b 0 0 2
0 0 c 0 4
0 0 -c d 4
0 0 -c -d 4
r4+r3,r5+r4
a 0 0 0 1
0 b 0 0 2
0 0 c 0 4
0 0 0 d 8
0 0 0 -d 8
r5+r4
a 0 0 0 1
0 b 0 0 2
0 0 c 0 4
0 0 0 d 8
0 0 0 0 16
= 16abcd.