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คณิตศาสตร์
[กลางภาค] คณิต (แฟกทอเรียล)
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![[กลางภาค] คณิต (แฟกทอเรียล) 封面](https://d1e9oo257tadp1.cloudfront.net/uploads/content/cover_file/843387/thumb_m_a9a7e58c9a.jpg?Expires=1776385008&Signature=PnRxP8RguFrta7irFQLdse9-QHZbDMlcRwg64V~OzErmb7-H3PVRVMpulwVm6mMkg2L~5fZGf-COpdRq23vSMn~KiCPPD52KF2Czz~c6rPd68n9HMQjSJ8Inbo9ZvhfVMfdrkSHwUR6bGxZjKjH5t29Qvv13AXzQIC3rpcyCr5Ez~vbzOISH9GFvO8wiwNqqkAkzdICQVoDmz-ZGT-9p~ARdOWbp3jOtek9KjNd5y9uKPZDeohybUofpS-ppo4hmP34Jm~TIrMOcD-N8PZCvEjHiD3iQ-SaHgnzRU~-k2mD4OgXc5Qk2i~aDFDaCaPPQtXRmvq1sxwlJZPs4BaDKow__&Key-Pair-Id=K2W722D70GJS8W)