题目内容
计算：
+
+
+
+
+
．
| 1 |
| 1988×1989 |
| 1 |
| 1989×1990 |
| 1 |
| 1990×1991 |
| 1 |
| 1991×1992 |
| 1 |
| 1992×1993 |
| 1 |
| 1993 |
| 1 |
| 1988×1989 |
| 1 |
| 1989×1990 |
| 1 |
| 1990×1991 |
| 1 |
| 1991×1992 |
| 1 |
| 1992×1993 |
| 1 |
| 1993 |
=（
| 1 |
| 1988 |
| 1 |
| 1989 |
| 1 |
| 1989 |
| 1 |
| 1990 |
| 1 |
| 1990 |
| 1 |
| 1991 |
| 1 |
| 1991 |
| 1 |
| 1992 |
| 1 |
| 1992 |
| 1 |
| 1993 |
| 1 |
| 1993 |
=
| 1 |
| 1988 |
| 1 |
| 1989 |
| 1 |
| 1989 |
| 1 |
| 1990 |
| 1 |
| 1990 |
| 1 |
| 1991 |
| 1 |
| 1991 |
| 1 |
| 1992 |
| 1 |
| 1992 |
| 1 |
| 1993 |
| 1 |
| 1993 |
=
| 1 |
| 1988 |
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