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Accounts receivable, net (Details 1)
12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Credit Loss [Abstract]      
Beginning balance $ 549,690 ¥ 3,951,391 ¥ 8,487,562
Addition 3,951,391
Recovery (549,690) (3,951,391)
Deconsolidation of Fe-da and subsidiaries (8,487,562)
Ending balance ¥ 3,951,391