题目列表(包括答案和解析)
| x | x1 | x2 | x3 | x4 | x5 | x6 | x7 |
| y | 1 | 3 | 7 | 13 | 21 | 31 | 43 |
| x | x1 | x2 | x3 | x4 | x5 | x6 | x7 |
| y | y1 | y2 | y3 | y4 | y5 | y6 | y7 |
| x | x1 | x2 | x3 | x4 | x5 | x6 | x7 |
| y | 10 | 50 | 110 | 190 | 290 | 412 | 550 |
| x | x1 | x2 | x3 | x4 | x5 | x6 | x7 |
| y | 1 | 3 | 7 | 13 | 21 | 31 | 43 |
| x | x1 | x2 | x3 | x4 | x5 | x6 | x7 |
| y | y1 | y2 | y3 | y4 | y5 | y6 | y7 |
| x | x1 | x2 | x3 | x4 | x5 | x6 | x7 |
| y | 10 | 50 | 110 | 190 | 290 | 412 | 550 |
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