题目内容
1+3
+5
+
+9
+11
=______.
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
1+3
+5
+
+9
+11
=(1+3+5+9+11)+(
+
+
+
+
)
=29+(
-
+
-
+
-
+
-
+
-
)
=29+(
-
)
=29+
=29
故答案为:29
.
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
=(1+3+5+9+11)+(
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
=29+(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 7 |
=29+(
| 1 |
| 2 |
| 1 |
| 7 |
=29+
| 5 |
| 14 |
=29
| 5 |
| 14 |
故答案为:29
| 5 |
| 14 |
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