题目
题型：不详难度：来源：
| 1 |
| 2 |
| 1 |
| 3 |
| 3 |
| 6 |
| 2 |
| 6 |
| 1 |
| 6 |
| 1 |
| 2×3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 4 |
| 12 |
| 3 |
| 12 |
| 1 |
| 12 |
| 1 |
| 3×4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 5 |
| 20 |
| 4 |
| 20 |
| 1 |
| 20 |
| 1 |
| 4×5 |
…
（1）用只含一个字母的等式表示这一列数的特征；
（2）利用（1）题中的规律计算：
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
答案
| 1 |
| n+1 |
| 1 |
| n+2 |
| 1 |
| (n+1)(n+2) |
（2）
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
=
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 7 |
=1-
| 1 |
| 7 |
=
| 6 |
| 7 |
核心考点
试题【观察下面的一列数：12-13=36-26=16=12×313-14=412-312=112=13×414-15=520-420=120=14×5…（1）用只含一】；主要考察你对数据的整理与描述等知识点的理解。[详细]
举一反三
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| 7 |
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| 15 |
| 16 |
| 31 |
| 32 |