题目内容
1-
-
-
-…-
=______.
| 1 |
| 1+2 |
| 1 |
| 1+2+3 |
| 1 |
| 1+2+3+4 |
| 1 |
| 1+2+3+4+…+100 |
1-
-
-
-…-
,
=1-(
+
+
+…+
),
=1-(
+
+
+…+
),
=1-2×(
+
+
+…+
),
=1-2×(
-
+
-
+
-
+…+
-
),
=1-2×(
-
),
=1-1+
,
=
.
故答案为
.
| 1 |
| 1+2 |
| 1 |
| 1+2+3 |
| 1 |
| 1+2+3+4 |
| 1 |
| 1+2+3+4+…+100 |
=1-(
| 1 |
| 1+2 |
| 1 |
| 1+2+3 |
| 1 |
| 1+2+3+4 |
| 1 |
| 1+2+3+4+…+100 |
=1-(
| 2 |
| 2×3 |
| 2 |
| 3×4 |
| 2 |
| 4×5 |
| 2 |
| 100×101 |
=1-2×(
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 1 |
| 4×5 |
| 1 |
| 100×101 |
=1-2×(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 100 |
| 1 |
| 101 |
=1-2×(
| 1 |
| 2 |
| 1 |
| 101 |
=1-1+
| 2 |
| 101 |
=
| 2 |
| 101 |
故答案为
| 2 |
| 101 |
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