题目内容
计算:(
+
+…+
)(1+
+
…+
)-(1+
+…+
)(
+
+…+
)
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 1999 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 1998 |
| 1 |
| 2 |
| 1 |
| 1999 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 1998 |
设:m=
+
+…
,则
原式=(m+
)(1+m)-(1+m+
)m
=(m+㎡+
+
)-(m+㎡+
),
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 1998 |
原式=(m+
| 1 |
| 1999 |
| 1 |
| 1999 |
=(m+㎡+
| 1 |
| 1999 |
| m |
| 1999 |
| m |
| 1999 |
=
| 1 |
| 1999 |
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