题目内容
1-
+
-
+
-
+
．
| 5 |
| 6 |
| 7 |
| 12 |
| 9? |
| 20 |
| 11 |
| 30 |
| 13 |
| 42 |
| 15 |
| 56 |
1-
+
-
+
-
+
，
=1-（
+
）+（
+
）-（
+
）+（
+
）-（
+
）+（
+
）
=1-
-
+
+
-
-
+
+
-
-
+
+
，
=1-
+
，
=
+
，
=
．
| 5 |
| 6 |
| 7 |
| 12 |
| 9? |
| 20 |
| 11 |
| 30 |
| 13 |
| 42 |
| 15 |
| 56 |
=1-（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 8 |
=1-
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 8 |
=1-
| 1 |
| 2 |
| 1 |
| 8 |
=
| 1 |
| 2 |
| 1 |
| 8 |
=
| 5 |
| 8 |
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