题目内容
4
+49
+499
+4999
+
=
| 11 |
| 12 |
| 11 |
| 12 |
| 11 |
| 12 |
| 11 |
| 12 |
| 1 |
| 3 |
4
+49
+499
+4999
+
,
=(4+49+499+4999)+
×4+
,
=(5-1+50-1+500-1+5000-1)+(
+
),
=5555-4+4,
=5555.
| 11 |
| 12 |
| 11 |
| 12 |
| 11 |
| 12 |
| 11 |
| 12 |
| 1 |
| 3 |
=(4+49+499+4999)+
| 11 |
| 12 |
| 1 |
| 3 |
=(5-1+50-1+500-1+5000-1)+(
| 11 |
| 3 |
| 1 |
| 3 |
=5555-4+4,
=5555.
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