请仔细观察下面行列式的计算过程，如果四个等号都理解了，请选择A，否则请选择B。
| a 1 1 1 1 | |a＋4 a＋4 a＋4 a＋4 a＋4|
| 1 a 1 1 1 | | 1 a 1 1 1 |
| 1 1 a 1 1 |= | 1 1 a 1 1 |
| 1 1 1 a 1 | | 1 1 1 a 1 |
| 1 1 1 1 a | | 1 1 1 1 a |
| 1 1 1 1 1 |
| 1 a 1 1 1 |
=(a＋4) | 1 1 a 1 1 |
| 1 1 1 a 1 |
| 1 1 1 1 a |
| 1 1 1 1 1 |
| 0 a–1 0 0 0 |
=(a＋4) | 0 0 a–1 0 0 |
| 0 0 0 a–1 0 |
| 0 0 0 0 a–1 |
=(a＋4)(a–1)^4
| a 1 1 1 1 | |a＋4 a＋4 a＋4 a＋4 a＋4|
| 1 a 1 1 1 | | 1 a 1 1 1 |
| 1 1 a 1 1 |= | 1 1 a 1 1 |
| 1 1 1 a 1 | | 1 1 1 a 1 |
| 1 1 1 1 a | | 1 1 1 1 a |
| 1 1 1 1 1 |
| 1 a 1 1 1 |
=(a＋4) | 1 1 a 1 1 |
| 1 1 1 a 1 |
| 1 1 1 1 a |
| 1 1 1 1 1 |
| 0 a–1 0 0 0 |
=(a＋4) | 0 0 a–1 0 0 |
| 0 0 0 a–1 0 |
| 0 0 0 0 a–1 |
=(a＋4)(a–1)^4
举一反三
- 若定义int a[2][2]={1,2,3,4},则a数组的各数组元素值分别为()。 A: a[0][0]=1,a[0][1]=2,a[1][0]=3,a[1][1]=4 B: a[0][0]=1,a[0][1]=3,a[1][0]=2,a[1][1]=4 C: a[0][0]=4,a[0][1]=3,a[1][0]=2,a[1][1]=1 D: a[0][0]=4,a[0][1]=2,a[1][0]=3,a[1][1]=1
- 以下HDB3码中，哪些可以确定其中有误码 A: +1 0 0 0 -1 0 +1 -1 +1 0 0 +1 0 -1 +1 -1 0 0 -1 +1…… B: +1 0 0 -1 +1 0 0 0 +1 -1 0 0 -1 0 0 0 +1 0 0 +1 -1…… C: -1 0 0 0 -1 0 +1 0 0 0 +1 -1 +1 0 0 +1 0 0 -1 +1…… D: -1 0 +1 0 0 0 -1 +1 0 0 0 +1 -1 +1 -1 0 0 -1 +1 0 -1……
- 1 1 1 1 1 0 1 1 1 1 0 0 1 1 1 0 0 0 1 1 0 0 0 0 1
- 1⊙1⊙1⊙1⊙0⊙0⊙0⊙0等于？（） A: 0⊙0⊙0⊙1 B: 1⊕1⊕1⊕1 C: 1⊙0⊙0⊙1 D: 1⊕1⊙0⊙0
- 对HDB3码-1000+100-1000-1+1000+1-1+1-100-1+1-1进行译码，结果是（ ）。 A: 1 0 0 0 1 0 0 1 0 0 0 0 1 0 0 0 0 1 1 0 0 0 0 1 1 B: 1 0 0 0 1 0 0 1 0 0 0 1 1 0 0 0 0 1 1 0 0 0 0 0 1 C: 1 0 1 0 1 0 0 1 0 0 0 0 1 1 0 0 0 1 1 0 0 0 0 1 1 D: 1 0 0 0 1 0 0 1 0 0 0 0 1 0 0 1 1 0 0 0 0 0 0 1 1