题干
观察下列等式：
+
=1
+
+ 10
+ 11
=12 16
+17
+19
+20
+22
+23
=39
| 1 |
| 3 |
| 2 |
| 3 |
| 7 |
| 3 |
| 8 |
| 3 |
| 3 |
| 3 |
| 3 |
| 3 |
| 3 |
| 3 |
| 3 |
| 3 |
…
则当m＜n且m，n∈N时，
+
+
+
+⋯+
+
=____（最后结果用m，n表示）
| 3 |
| m |
| + |
| 1 |
| 3 |
| 3 |
| m |
| + |
| 2 |
| 3 |
| 3 |
| m |
| + |
| 4 |
| 3 |
| 3 |
| m |
| + |
| 5 |
| 3 |
| 3 |
| n |
| 2 |
| 3 |
| 3 |
| n |
| 1 |
| 3 |
答案(点此获取答案解析）
n2﹣m2
