D=(n-1)乘以-1的(n-1)次方
将第一列*（-1）分别加到后面各列,得
01111... 11
1 -1000... 00
10 -100... 00
100 -10... 00
1000 -1... 00
.
10000...-10
10000... 0 -1
再将第2至第n行分别加到第1行,得
n-10000... 00
1 -1000... 00
10 -100... 00
100 -10... 00
1000 -1... 00
.
10000...-10
10000... 0 -1
所以,D=(n-1)乘以-1的(n-1)次方