题干
已知，观察下列不等式：
≥a1a2
≥a1a2a33
≥a1a2a3a44 ⋯⋯⋯
| a |
| 1 |
| + |
| a |
| 2 |
| 2 |
| a |
| 1 |
| + |
| a |
| 2 |
| + |
| a |
| 3 |
| 3 |
| a |
| 1 |
| + |
| a |
| 2 |
| + |
| a |
| 3 |
| + |
| a |
| 4 |
| 4 |
照此规律，当 n∈N+ (n≥2) 时，
≥ ____．
| a |
| 1 |
| + |
| a |
| 2 |
| + |
| a |
| 3 |
| + |
| ⋯ |
| + |
| a |
| n |
| n |
