| 10 |
| x |
又点A1的横坐标为2,
∴A1(2,5),A2(4,
| 5 |
| 2 |
∴S1=2×(5-
| 5 |
| 2 |
由题图象知,An(2n,
| 10 |
| 2n |
| 10 |
| 2n+2 |
∴S2=2×(
| 10 |
| 4 |
| 10 |
| 6 |
| 5 |
| 3 |
∴图中阴影部分的面积知:Sn=2×(
| 10 |
| 2n |
| 10 |
| 2n+2 |
| 10 |
| n(n+1) |
∵
| 1 |
| n(n+1) |
| 1 |
| n |
| 1 |
| n+1 |
∴S1+S2+S3+…+Sn=10(
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| n(n+1) |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| n |
| 1 |
| n+1 |
| 10n |
| n+1 |
故答案为:
| 10n |
| n+1 |
| 10 |
| x |

| 10 |
| x |
| 5 |
| 2 |
| 5 |
| 2 |
| 10 |
| 2n |
| 10 |
| 2n+2 |
| 10 |
| 4 |
| 10 |
| 6 |
| 5 |
| 3 |
| 10 |
| 2n |
| 10 |
| 2n+2 |
| 10 |
| n(n+1) |
| 1 |
| n(n+1) |
| 1 |
| n |
| 1 |
| n+1 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| n(n+1) |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| n |
| 1 |
| n+1 |
| 10n |
| n+1 |
| 10n |
| n+1 |