Created
November 29, 2013 17:12
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tiantianaixiyou
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| S2 = S1 + X | |
| S3 = S2 + XX | |
| S4 = S3 + S3 + X = S3 + S3 + X = 2S3 + X | |
| S5 = S4 + S3 + XX = S4 + S3 + 3X = 3S3 + 3X | |
| S6 = S5 + S4 + XXXX = S5 + 3S3 + 7X = 6S3 + 10X | |
| S7 = S6 + S5 + XXXX = S6 + 3S3 + 7X = 9S3 + 17X |
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