题目内容
| 1 |
| 22-1 |
| 1 |
| 42-1 |
| 1 |
| 62-1 |
| 1 |
| 1002-1 |
| 50 |
| 101 |
| 50 |
| 101 |
分析:根据平方差公式:原式=
×(
-
+
-
+…-
),再将括号里的数从第二个数开始进行计算,即可将括号中间的数消掉,再计算即可.
| 1 |
| 2 |
| 1 |
| 2-1 |
| 1 |
| 2+1 |
| 1 |
| 4-1 |
| 1 |
| 4+1 |
| 1 |
| 100+1 |
解答:解:
+
+
+…+
,
=
×(
-
+
-
+…-
),
=
×(
-
),
=
×
,
=
.
故答案为:
.
| 1 |
| 22-1 |
| 1 |
| 42-1 |
| 1 |
| 62-1 |
| 1 |
| 1002-1 |
=
| 1 |
| 2 |
| 1 |
| 2-1 |
| 1 |
| 2+1 |
| 1 |
| 4-1 |
| 1 |
| 4+1 |
| 1 |
| 100+1 |
=
| 1 |
| 2 |
| 1 |
| 2-1 |
| 1 |
| 100+1 |
=
| 1 |
| 2 |
| 100 |
| 101 |
=
| 50 |
| 101 |
故答案为:
| 50 |
| 101 |
点评:解决本题的关键是利用平方差公式将分数分解再利用简便运算计算.
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