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8:21

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8:36

#素人 ##無碼 #流出｜張旭微積分2020版(下)｜向量微積分｜重點四：曲線分析｜精選範例4-3｜數學老師張旭

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24:00

#高清 #無碼 #激情 #黑人｜張旭微積分2020版(下)｜多變數函數的微積分｜重點十三：相對極值、絕對極值、鞍點｜觀念講解｜數學老師張旭

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5:13

#真人 #無碼 #口教 #外流｜張旭微積分2020版(下)｜多變數函數的微積分｜重點十：方向導數｜精選範例 10-1｜數學老師張旭

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3:32

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6:06

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19:39

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7:29

#高清 #火辣 #黑髮 #偷拍｜張旭微積分2020版(下)｜多變數函數的微積分｜重點一：多變數函數｜精選範例 1-1｜數學老師張旭

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13:23

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7:02

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14:58

#持久 #黑髮 #高清 #外流｜張旭微積分2020版(下)｜多變數函數的微積分｜重點十六：二重積分的極座標轉換｜精選範例 16-4｜數學老師張旭

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2:39

#高清 #教師 #真人 #流出｜張旭微積分2020版(下)｜多變數函數的微積分｜重點十二：等值面與切平面｜精選範例 12-2｜數學老師張旭

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10:59

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3:09

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9:43

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27:31

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7:08

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6:19

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51:37

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3:49

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38:56

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9:59

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14:57

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2:22

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