摘要:10.观察下列各等式:
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观察下列各等式:
=
-
,
=
-
,
=
-
,…根据你发现的规律,计算:
+
+
+…+
= (n为正整数).
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| 1 |
| 1×2 |
| 1 |
| 1 |
| 1 |
| 2 |
| 1 |
| 2×3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3×4 |
| 1 |
| 3 |
| 1 |
| 4 |
| 2 |
| 1×2 |
| 2 |
| 2×3 |
| 2 |
| 3×4 |
| 2 |
| n×(n+1) |
观察下列各等式:
+
=2,
+
=2,
+
=2,
+
=2,依照以上各式成立的规律,在括号中填入适当的数,使等式
+
=2成立.
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| 2 |
| 2-4 |
| 6 |
| 6-4 |
| 5 |
| 5-4 |
| 3 |
| 3-4 |
| 7 |
| 7-4 |
| 1 |
| 1-4 |
| 10 |
| 10-4 |
| -2 |
| -2-4 |
| 20 |
| 20-4 |
| () |
| ()-4 |
观察下列各等式:0<a<1,
=
-
,
=
(
-
),…根据你发现的规律,计算:
+
+
+…+
= (n为正整数).
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| 1 |
| 2×3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3×5 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 1×4 |
| 1 |
| 4×7 |
| 1 |
| 7×10 |
| 1 |
| (3n-2)(3n+1) |