题目：
设M=| 20002001 |
| 20012000 |
| 20012002 |
| 20022001 |
答案
C解：设a=20002001，b=20012000，
则M=
| a |
| b |
| a+10001 |
| b+10001 |
M-N=
| a |
| b |
| a+10001 |
| b+10001 |
=
| a(b+10001)-b(a+10001) |
| b(b+10001) |
| 10001(a-b) |
| b(b+10001) |
∵a＜b，
∴M-N＜0，M＜N，
故选C．
| 20002001 |
| 20012000 |
| 20012002 |
| 20022001 |
| a |
| b |
| a+10001 |
| b+10001 |
| a |
| b |
| a+10001 |
| b+10001 |
| a(b+10001)-b(a+10001) |
| b(b+10001) |
| 10001(a-b) |
| b(b+10001) |
