求解答该行列式
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求解答该行列式
![](http://img.wesiedu.com/upload/b/72/b724411eb6bbfe333fa1d508e04ea1df.jpg)
![](http://img.wesiedu.com/upload/b/72/b724411eb6bbfe333fa1d508e04ea1df.jpg)
![求解答该行列式](/uploads/image/z/20139816-48-6.jpg?t=%E6%B1%82%E8%A7%A3%E7%AD%94%E8%AF%A5%E8%A1%8C%E5%88%97%E5%BC%8F%26nbsp%3B)
1=r1+r2+r3+...+rn
Dn=|3n-1 3n-1 3n-1 ...3n-1|
3 2 3 3
3 3 2 ...3
.
3 3 3 .2
r1提出公因子
Dn=(3n-1)|1 1 1 .1|
3 2 3 .3
3 3 2 .3
.
3 3 3 .2
各行减一行乘以3:r2-r1*3、r3-r1*3、...、rn-r1*3
Dn=(3n-1)*|1 1 1 ...1|
0 -1 0 ...0
0 0 -1 ...0
.
0 0 0 ...-1
Dn=[(-1)^n-1]*(3n-1)
Dn=|3n-1 3n-1 3n-1 ...3n-1|
3 2 3 3
3 3 2 ...3
.
3 3 3 .2
r1提出公因子
Dn=(3n-1)|1 1 1 .1|
3 2 3 .3
3 3 2 .3
.
3 3 3 .2
各行减一行乘以3:r2-r1*3、r3-r1*3、...、rn-r1*3
Dn=(3n-1)*|1 1 1 ...1|
0 -1 0 ...0
0 0 -1 ...0
.
0 0 0 ...-1
Dn=[(-1)^n-1]*(3n-1)