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You can learn math on Internet. 上網學數學 - 小學速率問題。
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Everyone can learn math or English easily from this video channel. Everyone can also learn how to speak Chinese. I hope everyone would love this video channel. 這英文與數學影片學習頻道能希望每個人都能很輕鬆的學習英文、中文與數學, 也希望大家能喜歡此影片頻道。喜歡它請訂閱此頻道，謝謝! Please subscribe this video channel. Thanks

防疫期間上網學數學(速率問題) Learn Math on Internet - Velocity Problems.

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