题目内容
11
+13
+15
+17
+19
+21
.
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
11
+13
+15
+17
+19
+21
,
=(11+13+15+17+19+21)+(
+
+
+
+
+
),
=(11+21)×6÷2+(1-
+
-
+
-
+
-
+
-
+
-
),
=96+(1-
),
=96+
,
=96
.
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
=(11+13+15+17+19+21)+(
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
=(11+21)×6÷2+(1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 7 |
=96+(1-
| 1 |
| 7 |
=96+
| 6 |
| 7 |
=96
| 6 |
| 7 |
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