Back 【解題】解決二位數的添加型加法問題:被加數未知 登入觀看 ⇐ Use this menu to view and help create subtitles for this video in many different languages. You'll probably want to hide YouTube's captions if using these subtitles. 【解題】解決二位數的添加型加法問題:被加數未知 上傳學習單 下載學習單