题目内容
计算:1+
+
+…+
=______.
| 1 |
| 1+2 |
| 1 |
| 1+2+3 |
| 1 |
| 1+2+3+…+100 |
1+
+
+…+
,
=
+
+…+
,
=2×[(1-
)+(
-
)+…+(
-
)],
=2(1-
),
=1
.
故答案为:1
.
| 1 |
| 1+2 |
| 1 |
| 1+2+3 |
| 1 |
| 1+2+3+…+100 |
=
| 2 |
| 1×2 |
| 2 |
| 2×3 |
| 2 |
| 100×101 |
=2×[(1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 100 |
| 1 |
| 101 |
=2(1-
| 1 |
| 101 |
=1
| 99 |
| 101 |
故答案为:1
| 99 |
| 101 |
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