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Investment in equity investees (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Cost method investments |  |
Carrying values of cost method investments | ¥ 9,750,726 | ¥ 5,138,973
Cost method investments | 6,217,682 | ¥ 2,210,552
Top investee one |  |
Cost method investments |  |
Cost method investments | 2,688,954 |
Top investee two |  |
Cost method investments |  |
Cost method investments | ¥ 1,029,608 |

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