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Long-term investments (Tables) | 12 Months Ended
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Dec. 31, 2024
Long-term Investments |
Schedule of Long-term investments |
Schedule of Long-term investments |  |  |  |  |  |  |  |  |  |  |  |
|  | December 31, 2023 |  |  | December 31, 2024 |  |  | December 31, 2024 |
|  | RMB |  |  | RMB |  |  | USD |
5.0% Investment in a company in mobile games industry |  |  | 600,000 |  |  |  | 600,000 |  |  |  | 83,468 |
5.0% Investment in a company in central processing advertising algorithm services |  |  | 600,000 |  |  |  | 600,000 |  |  |  | 83,468 |
Subtotal |  |  | 1,200,000 |  |  |  | 1,200,000 |  |  |  | 166,936 |
Less: Impairment loss |  |  | 1,102,938 |  |  |  | 1,102,938 |  |  |  | 153,433 |
Total |  |  | 97,062 |  |  |  | 97,062 |  |  |  | 13,503 |

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