题目内容
1
+2
+3
+4
+5
+6
+7
．
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 8 |
1
+2
+3
+4
+5
+6
+7
，
=（1+2+3+4+5+6+7）+（
+
+
+
+
+
+
），
=28+（
+
+
）+（
+
+
+
），
=28+（
+
+
-
）+
，
=29+
，
=29
．
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 8 |
=（1+2+3+4+5+6+7）+（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 8 |
=28+（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 8 |
=28+（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 201 |
| 280 |
=29+
| 201 |
| 280 |
=29
| 201 |
| 280 |
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