题目内容
1998
+1999
+2000
+2001
+2002
+
.
| 8 |
| 9 |
| 8 |
| 9 |
| 8 |
| 9 |
| 8 |
| 9 |
| 8 |
| 9 |
| 5 |
| 9 |
1998
+1999
+2000
+2001
+2002
+
,
=(1998+1999+2000+2001+2002)+
×5+
,
=(2000-2+2000-1+2000+2000+1+2000+2)+(
+
),
=2000×5+5,
=10000+5,
=10005.
| 8 |
| 9 |
| 8 |
| 9 |
| 8 |
| 9 |
| 8 |
| 9 |
| 8 |
| 9 |
| 5 |
| 9 |
=(1998+1999+2000+2001+2002)+
| 8 |
| 9 |
| 5 |
| 9 |
=(2000-2+2000-1+2000+2000+1+2000+2)+(
| 40 |
| 9 |
| 5 |
| 9 |
=2000×5+5,
=10000+5,
=10005.
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